mp3 250 workshop manual
DESCRIPTION
Piaggio MP3 250 Workshop ManualTRANSCRIPT
SERVICE STATION MANUAL633823
MP3 250 i.e.
SERVICE STATIONMANUAL
MP3 250 i.e.
The descriptions and illustrations given in this publication are not binding. While the basic specificationsas described and illustrated in this manual remain unchanged, PIAGGIO-GILERA reserves the right, at
any time and without being required to update this publication beforehand, to make any changes tocomponents, parts or accessories, which it considers necessary to improve the product or which are
required for manufacturing or construction reasons.Not all versions shown in this publication are available in all Countries. The availability of single versions
should be checked at the official Piaggio sales network."© Copyright 2007 - PIAGGIO & C. S.p.A. Pontedera. All rights reserved. Reproduction of this publication
in whole or in part is prohibited."PIAGGIO & C. S.p.A. - After-Sales
V.le Rinaldo Piaggio, 23 - 56025 PONTEDERA (Pi)
SERVICE STATION MANUALMP3 250 i.e.
This service station manual has been drawn up by Piaggio & C. Spa to be used by the workshops ofPiaggio-Gilera dealers. It is assumed that the user of this manual for maintaining and repairing Piaggiovehicles has a basic knowledge of mechanical principles and vehicle repair technique procedures. Anysignificant changes to vehicle characteristics or to specific repair operations will be communicated byupdates to this manual. Nevertheless, no mounting work can be satisfactory if the necessary equipmentand tools are unavailable. It is therefore advisable to read the sections of this manual relating to specialtools, along with the special tool catalogue.
N.B. Provides key information to make the procedure easier to understand and carry out.
CAUTION Refers to specific procedures to carry out for preventing damages to the vehicle.
WARNING Refers to specific procedures to carry out to prevent injuries to the repairer.
Personal safety Failure to completely observe these instructions will result in serious risk of personalinjury.
Safeguarding the environment Sections marked with this symbol indicate the correct use of the vehicleto prevent damaging the environment.
Vehicle intactness The incomplete or non-observance of these regulations leads to the risk of seriousdamage to the vehicle and sometimes even the invalidity of the guarantee.
INDEX OF TOPICS
CHARACTERISTICS CHAR
TOOLING TOOL
MAINTENANCE MAIN
TROUBLESHOOTING TROUBL
ELECTRICAL SYSTEM ELE SYS
ENGINE FROM VEHICLE ENG VE
ENGINE ENG
INJECTION INJEC
SUSPENSIONS SUSP
BRAKING SYSTEM BRAK SYS
COOLING SYSTEM COOL SYS
CHASSIS CHAS
PRE-DELIVERY PRE DE
TIME TIME
INDEX OF TOPICS
CHARACTERISTICS CHAR
This section describes the general specifications of the vehicle.
Rules
This section describes general safety rules for any maintenance operations performed on the vehicle.
Safety rules
- If work can only be done on the vehicle with the engine running, make sure that the premises are well-
ventilated, using special extractors if necessary; never let the engine run in an enclosed area. Exhaust
fumes are toxic.
- The battery electrolyte contains sulphuric acid. Protect your eyes, clothes and skin. Sulphuric acid is
highly corrosive; in the event of contact with your eyes or skin, rinse thoroughly with abundant water
and seek immediate medical attention.
- The battery produces hydrogen, a gas that can be highly explosive. Do not smoke and avoid sparks
or flames near the battery, especially when charging it.
- Fuel is highly flammable and it can be explosive given some conditions. Do not smoke in the working
area, and avoid open flames or sparks.
- Clean the brake pads in a well-ventilated area, directing the jet of compressed air in such a way that
you do not breathe in the dust produced by the wear of the friction material. Even though the latter
contains no asbestos, inhaling dust is harmful.
Maintenance rules
- Use original PIAGGIO spare parts and lubricants recommended by the Manufacturer. Non-original or
non-conforming spares may damage the vehicle.
- Use only the appropriate tools designed for this vehicle.
- Always use new gaskets, sealing rings and split pins upon refitting.
- After removal, clean the components using non-flammable or low flash-point solvent. Lubricate all the
work surfaces except the tapered couplings before refitting.
- After refitting, make sure that all the components have been installed correctly and work properly.
- For removal, overhaul and refit operations use only tools with metric measures. Metric bolts, nuts and
screws are not interchangeable with coupling members with English measurement. Using unsuitable
coupling members and tools may damage the scooter.
- When carrying out maintenance operations on the vehicle that involve the electrical system, make
sure the electric connections have been made properly, particularly the ground and battery connections.
Characteristics MP3 250 i.e.
CHAR - 2
Vehicle identification
Chassis prefix (FULL OPTIONAL): M47201
Chassis prefix (BASE): M47200
Engine prefix: M472M
Dimensions and mass
WEIGHTS AND DIMENSIONSSpecification Desc./QuantityKerb weight 224 ± 5 KgWheelbase 1490 mm
Height 1245 mmWidth (handlebar) 745 mm
Overall length 2130 mmTrack 420 mm
Engine
DATASpecification Desc./Quantity
Type single-cylinder, four-stroke and four liquid-cooledvalves
MP3 250 i.e. Characteristics
CHAR - 3
Specification Desc./QuantityTiming system single overhead camshaft chain driven on the left-
hand side, three-arm rocking levers set up withthreaded set screw
Bore 72 mmStroke 60 mm
Cubic capacity 249.29 mmCompression ratio 10.5 ÷ 11.5
Air filter sponge, impregnated with mixture (50% petrol and50% oil)
Starting system electric starter motor with freewheelLubrication with lobe pump (inside the crankcase) chain-driv-
en and double filter: mesh and paperFuel supply by electronic injection with electric fuel pump
valve clearance intake: 0.10 mm - discharge: 0.15 mmEngine idle speed approx. 1600 ÷ 1800 rpm
Max. speed 125 km/h
Transmission
TRANSMISSIONSpecification Desc./QuantityTransmission Automatic expandable pulley variator with torque
server, V belt, automatic clutch, gear reduction unitand transmission housing with forced air circula-
tion cooling
Capacities
CAPACITYSpecification Desc./Quantity
Engine oil approx. 1300 cc (recommended oil Selenia HIScooter 4 Tech)
Rear hub 250 cc ( recommended oil TUTELA MATRIX)Fuel tank capacity Tank capacity: ~12 l (approximate value)
Fuel reserve approx. 2.5 litres (indicative value)Cooling circuit Capacity: ~ 2.0 l
Electrical system
ELECTRICAL COMPONENTSSpecification Desc./Quantity
Ignition/advance Electronic, with inductive discharge and variableadvance with three-dimensional mapping
Spark plug CHAMPION RG 4 PHPBattery 12V-12Ah
Generator alternating current
Characteristics MP3 250 i.e.
CHAR - 4
Frame and suspensions
FRAME AND SUSPENSIONSSpecification Desc./Quantity
Chassis Tubular and sheet steel.Rear suspension Single arm with two double-acting hydraulic shock
absorbers and preloading adjustable to 4 posi-tions.
Front suspension The tilt mechanism is composed of an articulatedparallelogram suspension with die-cast aluminiumcontrol arms and two side headstocks plus shock
absorbers with hydraulic locking system.
Brakes
BRAKES
Specification Desc./QuantityFront brake Ø 240 mm double disk with hydraulic control acti-
vated by the handlebar right-hand lever.Rear brake Ø 240 mm disc brake with hydraulic control acti-
vated by the handlebar left-side lever.
Wheels and tyres
WHEELS AND TYRESSpecification Desc./QuantityFront wheel Alloy rims: 12" x 3.00"Rear wheel alloy rim: 12"x3,00Front tyre 120/70-12", without inner tubeRear tyre Without inner tube: 130/70-12" 62P
TYRE PRESSURESpecification Desc./Quantity
Front tyre pressure (rider) Front tyre pressure (rider): 1.6 barFront tyre pressure (rider and passenger) Front tyre pressure (rider and passenger): 1.8 bar
Rear tyre pressure (rider) Rear tyre pressure (rider): 2 barRear wheel pressure (rider and passenger): Rear tyre pressure (rider and passenger): 2.4 bar
N.B.
CHECK AND ADJUST TYRE PRESSURE WITH TYRES AT AMBIENT TEMPERATURE. REGU-LATE PRESSURE ACCORDING TO THE WEIGHT OF THE RIDER AND ACCESSORIES
Tightening Torques
STEERINGName Torque in Nm
Steering lower ring nut (central headstock) 22 ÷ 27 loosen by 90°Steering upper ring nut (central headstock) 27 ÷ 33
Handlebar fixing screw 50 ÷ 55Fixing screws for handlebar control assembly U-
bolts7 ÷ 10
MP3 250 i.e. Characteristics
CHAR - 5
FRAMEName Torque in Nm
Engine arm bolt - frame arm 33 ÷ 41Swinging arm buffer nut 64 - 72
Engine-swinging arm bolt 55 ÷ 61Frame-swinging arm bolt 55 ÷ 61
Centre stand bolt 31 ÷ 39
FRONT SUSPENSIONName Torque in Nm
Shock absorber lower clamp 19 ÷ 26Upper shock absorber clamp 19 ÷ 29
Front wheel fixing screws 19 ÷ 24Steering arm bolt nut 20 ÷ 25
Tilt calliper fixing screws 20 ÷ 25Front wheel shaft 74 ÷ 88
Arm coupling screws 45 ÷ 50Screws fixing arms to side headstocks 45 ÷ 50
Screws fixing arms to central headstock 45 ÷ 50Screws fixing the half-arm coupling flange 20 ÷ 25Fixing screws for tilt locking disc section 20 ÷ 25
Side headstock upper ring nut 20 - 24Side headstock lower ring nut 12 ÷ 15
Screw fixing sliding stem to shock absorber 45 ÷ 50Clamp for sliding stem locking device 6.5 ÷ 10.5
Fixing nuts for constant-velocity universal joints 18 ÷ 20Potentiometer to anti-tilting device clamp 8 ÷ 10Electric motor to anti-tilting device clamp 11 ÷ 13
Clamp fixing pump bolt to anti-tilting device 11 ÷ 13Pump to anti-tilting device clamp 11 ÷ 13
Pressure switch to distribution frame 18 ÷ 20Sensor to tilt gripper clamp 2.5 ÷ 2.9
Pipe terminals to fifth wheel check spring 7 ÷ 11Joint to anti-tilting device pump 20 ÷ 25
Lower fitting for shock absorber sliding lockingclamp pipes
20 ÷ 25
Upper fitting for shock absorber sliding lockingclamp pipes
20 ÷ 25
REAR SUSPENSIONName Torque in Nm
Upper shock absorber clamp 33 ÷ 41Shock absorber lower clamp 33 ÷ 41
Shock absorber-crankcase attachment bracket 20 ÷ 25Rear wheel axle 104 ÷ 126
Muffler arm clamping screws 27 ÷ 30
FRONT BRAKEName Torque in Nm
Oil bleed screw 8÷12Disc tightening screw (°) 5 - 6
Brake fluid pump - hose fitting 16 ÷ 20Brake fluid pipe-calliper fitting 20 ÷ 25
Characteristics MP3 250 i.e.
CHAR - 6
Name Torque in NmScrew tightening calliper to the support 20 ÷ 25
Calliper upper pipe fitting 20 ÷ 25
REAR BRAKEName Torque in Nm
Rear brake disc screws(°) 5 ÷ 6.5Rear brake calliper-pipe fitting 20 ÷ 25
Rigid / flexible pipe fitting 13 ÷ 18Rear brake pump-pipe fitting 16 ÷ 20
Rear brake calliper fixing screws 20 ÷ 25
REAR BRAKEProduct Description Specifications
(°) Loctite 243 Medium strength threadlock Apply LOCTITE 243 medium-strength threadlock
MUFFLERName Torque in Nm
Muffler heat guard fixing screw 4 ÷ 5Screw for fixing muffler to the support arm 20 ÷ 25Lambda probe clamp on exhaust manifold 40 ÷ 50
Exhaust manifold-muffler joint clamp 12 ÷ 13Manifold - muffler diaphragm tightening clamp 16 ÷ 18
LUBRICATIONName Torque in Nm
Hub oil drainage plug 15 ÷ 17Oil filter on crankcase fitting 27 ÷ 33
Engine oil drainage plug/mesh filter 24 ÷ 30Oil filter 4 ÷ 6
Oil pump cover screws 7 ÷ 9Screws fixing oil pump to the crankcase 5 - 6
Oil pump control crown screw 10 ÷ 14Oil pump cover plate screws 4 ÷ 6
Oil sump screws 10 ÷ 14Minimum oil pressure sensor 12 ÷ 14
CYLINDER HEADName Torque in Nm
Spark plug 12 ÷ 14Head cover screws 6 ÷ 7
Nuts fixing head to cylinder 7±1 + 10±1 + 270°Head fixing side screws 11 ÷ 12 Nm
Starter ground screw 7 ÷ 8.5Tappet set screw lock nut 6 ÷ 8
Inlet manifold screws 11 ÷ 13Timing chain tensioner slider screw 10 ÷ 14
Starter ground support screw 11 ÷ 15Timing chain tensioner support screw 11 ÷ 13Timing chain tensioner central screw 5 - 6
Camshaft retention plate screw 4 ÷ 6
MP3 250 i.e. Characteristics
CHAR - 7
TRANSMISSION
Name Torque in NmBelt support roller screw 11 ÷ 13
Clutch unit nut on driven pulley 45 ÷ 50Drive pulley nut 75 ÷ 83
Transmission cover screws 11 ÷ 13Driven pulley shaft nut 54 ÷ 60Rear hub cap screws 24 ÷ 27
FLYWHEELName Torque in Nm
Flywheel cover screw 11 ÷ 13Stator assembly screws 3 - 4 (Apply LOCTITE 242 medium-strength
threadlock)Flywheel nut 94 - 102 Nm
Pick-Up clamping screws 3 ÷ 4Screw fixing freewheel to flywheel 13 ÷ 15
CRANKCASE AND CRANKSHAFTName Torque in Nm
Internal engine crankcase bulkhead (transmis-sion-side half shaft) screws
4 ÷ 6
Engine-crankcase coupling screws 11 ÷ 13Starter motor screws 11 ÷ 13
Crankcase timing cover screws 3.5 - 4.5 (Apply LOCTITE 242 medium-strengththreadlock)
COOLINGName Torque in Nm
Water pump rotor cover 3 ÷ 4Thermostat cover screws 3 ÷ 4
Bleed screw: 3
Overhaul data
Assembly clearances
Characteristics MP3 250 i.e.
CHAR - 8
Cylinder - piston assy.
ENGINE COUPLING CATEGORYName Initials Cylinder Piston Play on fitting
Cylinder M 72.01 ÷ 72.017 71.953 ÷ 71.960 0.050 - 0.064Cylinder N 72.017 ÷ 72.024 71.960 ÷ 71.967 0.050 - 0.064Piston O 72.024 ÷ 72.031 71.967 ÷ 71.974 0.050 - 0.064Piston P 72.031 ÷ 72.038 71.974 ÷ 71.981 0.050 - 0.064
Crankcase - crankshaft - connecting rod
CRANKSHAFT
Titolo Durata/Valore Testo Breve (< 4000car.)
Indirizzo Immagine
Crankshaft Crankshaft to crankcaseaxial clearance
Crankshaft to crankcase axial clearance
MP3 250 i.e. Characteristics
CHAR - 9
CRANKSHAFT/ CRANKCASE AXIAL CLEARANCEName Description Dimensions Initials Quantity
Half-shaft, trans-mission side
16.6 +0-0.05 A D = 0.20 - 0.50
Flywheel-side half-shaft
16.6 +0-0.05 B D = 0.20 - 0.50
Connecting rod 18 -0.10 -0.15 C D = 0.20 - 0.50Spacer tool 51.4 +0.05 E D = 0.20 - 0.50
Slot packing system
CharacteristicCompression ratio
10.5 ÷ 11.5 : 1
Characteristics MP3 250 i.e.
CHAR - 10
Measurement "A" to be taken is a value of piston re-entry, it indicates by how much the plane formed
by the piston crown falls below the plane formed by the top of the cylinder. The further the piston falls
inside the cylinder, the less the base gasket to be applied (to recover the compression ratio) and vice
versa.N.B.
MEASUREMENT "A" MUST BE TAKEN WITHOUT ANY GASKET FITTED BETWEEN THE CRANK-CASE AND CYLINDER AND AFTER RESETTING THE GAUGE, EQUIPPED WITH A SUPPORT, ONA GROUND PLANE
ENGINE 250 SHIMMINGName Measure A Thickness
shimming 3.70 - 3.60 0.4 ± 0.05shimming 3.60 - 3.40 0.6 ± 0.05shimming 3.40 - 3.30 0.8 ± 0.05
MP3 250 i.e. Characteristics
CHAR - 11
Products
RECOMMENDED PRODUCTS TABLEProduct Description Specifications
AGIP ROTRA 80W-90 Rear hub oil SAE 80W/90 Oil that exceeds therequirements of API GL3 specifi-
cationsAGIP CITY HI TEC 4T Oil to lubricate flexible transmis-
sions (throttle control)Oil for 4-stroke engines
AGIP FILTER OIL Oil for air filter sponge Mineral oil with specific additivesfor increased adhesiveness
AGIP GP 330 Grease for brake levers, throttle White calcium complex soap-based spray grease with NLGI 2;
ISO-L-XBCIB2AGIP CITY HI TEC 4T Engine oil SAE 5W-40, API SL, ACEA A3,
JASO MA Synthetic oilAGIP BRAKE 4 Brake fluid FMVSS DOT4 Synthetic fluid
SPECIAL AGIP PERMANENTfluid
coolant Monoethylene glycol-based anti-freeze fluid, CUNA NC 956-16
Characteristics MP3 250 i.e.
CHAR - 12
INDEX OF TOPICS
TOOLING TOOL
APPROPRIATE TOOLStores code Description
001330Y Tool for fitting steering seats
001467Y014 Pliers to extract ø 15-mm bear-ings
005095Y Engine support
002465Y Pliers for circlips
006029Y Punch for fitting fifth wheel seaton steering tube
020004Y Punch for removing fifth wheelsfrom headstock
020055Y Wrench for steering tube ring nut
Tooling MP3 250 i.e.
TOOL - 2
Stores code Description020074Y Support base for checking crank-
shaft alignment
020150Y Air heater support
020151Y Air heater
020193Y Oil pressure gauge
020262Y Crankcase splitting strip
020263Y Sheath for driven pulley fitting
MP3 250 i.e. Tooling
TOOL - 3
Stores code Description020306Y Punch for assembling valve seal
rings
020329Y MityVac vacuum-operated pump
020330Y Stroboscopic light for timing con-trol
020331Y Digital multimeter
020332Y Digital rev counter
Tooling MP3 250 i.e.
TOOL - 4
Stores code Description020333Y Single battery charger
020334Y Multiple battery charger
020335Y Magnetic support for dial gauge
020357Y 32 x 35 mm adaptor020359Y 42x47-mm adaptor
020360Y Adaptor 52 x 55 mm
MP3 250 i.e. Tooling
TOOL - 5
Stores code Description020363Y 20 mm guide
020375Y Adaptor 28 x 30 mm
020376Y Adaptor handle
020382Y Valve cotters equipped with part012 removal tool
020382Y011 adapter for valve removal tool
Tooling MP3 250 i.e.
TOOL - 6
Stores code Description020393Y Piston fitting band
020412Y 15 mm guide
020423Y driven pulley lock wrench
020424Y Driven pulley roller casing fittingpunch
020426Y Piston fitting fork
MP3 250 i.e. Tooling
TOOL - 7
Stores code Description020431Y Valve oil seal extractor
020434Y Oil pressure control fitting
020444Y Tool for fitting/ removing the driv-en pulley clutch
020456Y Ø 24 mm adaptor020477Y Adaptor 37 mm
020483Y 30 mm guide
Tooling MP3 250 i.e.
TOOL - 8
Stores code Description020489Y Hub cover support stud bolt set
020428Y Piston position check support
020460Y Scooter diagnosis and tester
020621Y HV cable extraction adaptor
020481Y Control unit interface wiring
001467Y035 Belle for OD 47-mm bearings
MP3 250 i.e. Tooling
TOOL - 9
Stores code Description020626Y Driving pulley lock wrench
001467Y013 Pliers to extract ø 15-mm bear-ings
020627Y Flywheel lock wrench
020467Y Flywheel extractor
020454Y Tool for fitting piston pin stops(200 - 250)
020622Y Transmission-side oil guardpunch
Tooling MP3 250 i.e.
TOOL - 10
Stores code Description020480Y Petrol pressure check set
020244Y 15-mm diameter punch
020115Y Ø 18 punch
020271Y Tool for removing-fitting silentbloc
020469Y Reprogramming kit for scooterdiagnosis tester
MP3 250 i.e. Tooling
TOOL - 11
Stores code Description020481Y004 Parking control unit interface wir-
ing
020639Y Tilt locking control unit software
020645Y MIU software updating with CANlines
001467Y017 Driver for OD 36 mm bearings
020234y extractor020441Y 26 x 28 mm adaptor
Tooling MP3 250 i.e.
TOOL - 12
Stores code Description020362Y 12 mm guide
020358Y 37x40-mm adaptor001467Y002 Driver for OD 73 mm bearing
MP3 250 i.e. Tooling
TOOL - 13
Tooling MP3 250 i.e.
TOOL - 14
INDEX OF TOPICS
MAINTENANCE MAIN
Follow these steps to reset the service icons:
1. With the key set to OFF, hold down the
"SET" button and turn the key to ON : the
"BELT" and "SERVICE" icons start flashing.
2. Push the "CLOCK" button for less than 1
second and the icons are displayed sequen-
tially. The icon selected remains ON and the
other is no longer displayed.
3. Press the "CLOCK" button again for more
than 3 seconds to reset the relative mainte-
nance step and the icon is no longer dis-
played.
Maintenance chart
EVERY 2 YEARS60'
ActionCoolant - changeBrake fluid - change
AFTER 1,000 KM75'
ActionSafety locks - checkThrottle lever - adjustmentEngine oil - changeElectrical system and battery - checkCoolant level - checkBrake fluid level - checkEngine oil - replacementBrake pads - check condition and wearTyre pressure and wear - checkVehicle and brake test - road testHub oil - changeSteering - CheckTilt locking gripper control cable - adjustment
AFTER 5,000 KM, 15,000 KM, 25,000 KM, 35000 KM, 45,000 KM, 55,000 KM, 65,000 KM,75,000 KM
10'Action
Engine oil - level check/ top-upBrake pads - check condition and wear
AFTER 10,000 KM 50,000 KM 70,000 KM115'
Maintenance MP3 250 i.e.
MAIN - 2
ActionSafety locks - checkThrottle lever - adjustmentAir filter - cleanEngine oil - changeElectrical system and battery - checkCoolant level - checkBrake fluid level - checkEngine oil - replacementBrake pads - check condition and wearSliding block / variable speed rollers - changeTyre pressure and wear - checkVehicle and brake test - road testHub oil - checkSuspensions - checkSteering - CheckCentre stand - lubricationTilt locking gripper control cable - adjustment
AFTER 20,000 KM, 35,000 KM, 50,000 KM, 65,000 KM, 80,000 KM35'
ActionDriving Belt - replacement
AFTER 20,000 KM, 40,000 KM, 80,000 KM165'
ActionSpark plug - replacementThrottle lever - adjustmentAir filter - cleanEngine oil - changeValve clearance - checkElectrical system and battery - checkCoolant level - checkBrake fluid level - checkEngine oil - replacementBrake pads - check condition and wearSliding block / variable speed rollers - changeTyre pressure and wear - checkVehicle and brake test - road testHub oil - changeSuspensions - checkSteering - CheckTilt locking gripper control cable - adjustment
30,000 KM155'
ActionSafety locks - checkThrottle lever - adjustmentAir filter - cleanEngine oil - changeElectrical system and battery - check
MP3 250 i.e. Maintenance
MAIN - 3
ActionCoolant level - checkBrake fluid level - checkEngine oil - replacementHub oil - checkBrake pads - check condition and wearSliding block / variable speed rollers - changeTyre pressure and wear - checkVehicle and brake test - road testSuspensions - checkSteering - CheckTilt locking gripper control cable - adjustment
60,000 KM205'
ActionSpark plug - replacementThrottle lever - adjustmentAir filter - cleanEngine oil - changeValve clearance - checkElectrical system and battery - checkCoolant level - checkBrake fluid level - checkEngine oil - replacementHub oil - changeBrake pads - check condition and wearSliding block / variable speed rollers - changeTyre pressure and wear - checkVehicle and brake test - road testSuspensions - checkSteering - CheckTilt locking gripper control cable - adjustment
Checking the spark advance
The ignition advance is determined electronically
on the basis of parameters known by the control
unit. For this reason it is not possible to declare the
reference values based on the engine rpm. The
ignition timing value is detectable any time using
the diagnostic tester. It is possible to check wheth-
er the ignition advance determined by the system
does in fact correspond with the value actually ac-
tivated on the engine, by means of the strobo-
scopic light.
Proceed as follows:
- Remove the spark plug.
Maintenance MP3 250 i.e.
MAIN - 4
- Remove the transmission crankcase.
- Rotate the driving pulley fan until the reference
marks between the flywheel and flywheel cover
coincide as shown in the photograph.
- Bring the reference mark onto the transmission
side between the fan and the transmission cover
as shown in the photograph.
- Refit the spark plug.
- Refit the plastic cap on the flywheel cover.
- Adjust the spark gap to the contact position (no
reference mark visible) and install it on engine be-
tween the spark plug and spark plug cap
- Connect the induction calliper on the spark gap
cable respecting the proper polarity (the arrow on
the calliper must be pointing at the spark plug).
- Connect the diagnostic tester.
- Start the engine.
- Select the «parameter» function in this menu.
- Select the stroboscopic light command in the tra-
ditional four-stroke engine position (1 spark 2
revs).
- Check that the real values of rpm and ignition
advance match those measured using the diag-
nostic tester.
If the values do not correspond, check:
- distribution timing
- revolution-timing sensor
- Injection control unit
Specific tooling020460Y Scooter diagnosis and tester
020330Y Stroboscopic light for timing control
020621Y HV cable extraction adaptor
MP3 250 i.e. Maintenance
MAIN - 5
Spark plug
Remove the port on the right-hand side panel of
the vehicle by undoing the clamping screw and
using a small screwdriver in the rear recess shown
in the figure, then do the following :
1. Disconnect spark plug HV wire cap "A";
2. Unscrew the spark plug using the wrench sup-
plied. ;
3. When refitting, place the spark plug in the hole
at the due inclination and tighten it by hand until it
is finger tight;
4. Only use the wrench to lock it in place;
5. Place hood«A» fully over the spark plug.
6. Refit the port making sure the rear hook is in-
serted.WARNING
THE SPARK PLUG MUST BE REMOVED WHENTHE ENGINE IS COLD. THE SPARK PLUGMUST BE REPLACED EVERY 20,000 KM. USEOF ELECTRONIC CONTROL UNITS OR ELEC-TRONIC IGNITIONS DIFFERING FROM THOSERECOMMENDED CAN SERIOUSLY DAMAGETHE ENGINE.N.B.
THE USE OF SPARK PLUGS OTHER THANTHE INDICATED TYPE OR OF SHIELDLESSSPARK PLUG CAPS CAN CAUSE ELECTRI-CAL SYSTEM FAILURES.
Electric characteristicSpark plug
Maintenance MP3 250 i.e.
MAIN - 6
CHAMPION RG4 PHP
Electrode gap
0.7 ÷ 0.8 mm
Hub oil
Check
- Park the vehicle on its centre stand on flat
ground;
- Remove the oil dipstick «A», dry it with a clean
cloth and put it back into its hole tightening it
completely;
Remove the dipstick and check that the oil level is
slightly over the second notch starting from the
lower end; if the level is under the MAX. mark, it
needs to be filled with the right amount of hub oil.
-Screw up the oil dipstick again and make sure it
is locked properly into place.
Replacement
-Remove the oil cap «A».
- Unscrew the oil drainage cap "B" and drain out
all the oil.
- Screw in the drainage cap again and fill the hub
with the prescribed oil.
Recommended productsAGIP ROTRA 80W-90 Rear hub oil
SAE 80W/90 Oil that exceeds the requirements of
API GL3 specifications
CharacteristicRear hub oil
Capacity approximately 250 cc
Locking torques (N*m)Hub oil drainage screw 15 ÷ 17 Nm
MP3 250 i.e. Maintenance
MAIN - 7
Air filter
Proceed as follows:
Undo the clamping screws «A» (two of which are
on the knob-type head) and remove the air-box
cover.
1. Wash the sponge with water and neutral soap.
2. Dry it with a clean cloth and small blasts of compressed air.
3. Impregnate the sponge with a mixture of 50% petrol and 50% specified oil.
4. Gently squeeze the filter element, let it drip and then refit it.CAUTION
IF THE VEHICLE IS USED ON DUSTY ROADS IT IS NECESSARY TO CARRY OUT MAINTENANCECONTROLS OF THE AIR FILTER TO AVOID DAMAGING THE ENGINE.
Recommended productsAGIP FILTER OIL Oil for air filter sponge
Mineral oil with specific additives for increased adhesiveness
Engine oil
In 4T engines, the engine oil is used to lubricate the distribution elements, the bench bearings and the
thermal group. An insufficient quantity of oil can cause serious damage to the engine.
In all 4T engines, the deterioration of the oil characteristics, or a certain consumption should be con-
sidered normal, especially if during the run-in period. Consumption levels in particular can be influenced
by the conditions of use (e.g.: oil consumption increases when driving at "full throttle".
Replacement
At 1,000 km and after every 10,000 km, the oil and
the filter must be changed. The engine must be
drained by running off the oil from drainage cap
"B" of the flywheel side gauze pre-filter; further-
more to facilitate oil drainage, loosen the cap/
dipstick "A". Once all the oil has drained through
the drainage hole, unscrew the oil cartridge filter
"C" and remove it.
Maintenance MP3 250 i.e.
MAIN - 8
Make sure the pre-filter and discharge tap O-rings
are in good condition.
Lubricate them and refit the gauze filter and oil
drainage tap, screwing them up to the specified
torque.
Refit the new cartridge filter being careful to lubri-
cate the O-ring before fitting it.
Change the engine oil.
Since a certain quantity of oil still remains in the
circuit, oil must be filled from cap "A". Then start
up the scooter, leave it running for a few minutes
and switch it off: after five minutes check the level
and if necessary top up without exceeding the
MAX level. The cartridge filter must be replaced
every time the oil is changed. Use new oil of the
recommended type for topping up and changing
purposes.N.B.
THE ENGINE MUST BE HOT WHEN THE OIL ISCHANGED.
Recommended productsAGIP CITY HI TEC 4T Engine oil
SAE 5W-40 Synthetic oil that exceed the require-
ments of API SL, ACEA A3, JASO MA specifica-
tions
Check
This operation must be carried out with the engine
cold and following the procedure below:
1. Place the vehicle on its centre stand and on
flat ground.
2. Undo cap/dipstick "A", dry it off with a clean
cloth and replace it, screwing down com-
pletely.
3. Remove the cap/dipstick again and check
that the level is between the min and max.
marks; top up if necessary.
MP3 250 i.e. Maintenance
MAIN - 9
The MAX level mark indicates a quantity of around
1300 cc of engine oil. If the check is carried out
after the vehicle has been used, and therefore with
a hot engine, the level line will be lower; in order
to carry out a correct check it is necessary to wait
at least 10 minutes after the engine has been stop-
ped, so as to get the correct level.
Oil top up
The oil should be topped up after having checked the level and in any case by adding oil without ever
exceeding the MAX. level.
Restoration of the level from MIN to MAX requires approximately 200 cc.
Engine oil filter
The cartridge filter must be replaced every time the oil is changed. Use new oil of the recommended
type for topping up and changing purposes.
Make sure the pre-filter and drainage plug O-rings are in good conditions. Lubricate them and refit the
mesh filter and oil drainage plug, screwing them up to the specified torque. Refit the new cartridge filter
being careful to lubricate the O-ring before the fitting. Change the engine oil.
Recommended productsAGIP CITY HI TEC 4T Engine oil
SAE 5W-40 Synthetic oil that exceed the requirements of API SL, ACEA A3, JASO MA specifications
Oil pressure warning light
The vehicle is equipped with a warning light on the
instrument panel that lights up when the key is
turned to the «ON» position. However, this light
should switch off once the engine has been star-
ted.
If the light turns on during braking, at idling
speed or while turning a corner, it is necessary
to check the oil level and the lubrication sys-
tem.
Maintenance MP3 250 i.e.
MAIN - 10
Checking the ignition timing
-Remove the plastic cap on the flywheel cover
-Turn the flywheel until the reference mark «T» on
the rotor matches the reference mark on the fly-
wheel cover as shown in the figure (TDC). Make
sure that the 4V reference point on the camshaft
control pulley is aligned with the reference point on
the head as shown in the second figure. If the ref-
erence is opposite the indicator on the head, turn
the crankshaft once more.
For the use of this reference mark, remove the
spark plug and turn the engine in the direction that
is the reverse of the normal direction using a cal-
liper spanner applied to the camshaft command
pulley casing.
Cooling system
Introduction of the engine coolant.
The fluid level must checked every 10,000 kilome-
tres with a cold engine, in the way shown below:
Place the scooter on its centre stand and on flat
ground.
- Undo the screw shown in the figure and remove
the expansion tank cap on RHS.
- Top up if the fluid level is near or below the MIN
level edge. The liquid level must always be be-
tween the MIN and MAX level.
-The coolant consists of an ethylene glycol and
corrosion inhibitor based 50% demineralised wa-
ter- antifreeze solution mix.CAUTION
DO NOT EXCEED THE MAX. LEVEL WHENFILLING SO AS TO AVOID THE COOLANT ES-CAPING FROM THE EXPANSION TANK WHENTHE vehicle IS IN USE.
MP3 250 i.e. Maintenance
MAIN - 11
Braking system
Level check
The front and rear brake fluid reservoirs are both
positioned on the handlebars. Proceed as follows:
- Rest the vehicle on its centre stand with the han-
dlebars perfectly horizontal;
- Check the fluid level through the sight glass
«C». A certain lowering of the level is caused by
wear on the pads.
Top-up
Proceed as follows: Loosen the screw "B" and lift
the plastic cover "A" in order to access the brake
fluid reservoir. Loosen the two fixing screws and
remove the reservoir cover; top-up with the rec-
ommended fluid without exceeding the 'MAX.'
mark.
This procedure applies to the rear brake pump top-
up operation; follow the same procedure for the
front brake pump.
Under normal climatic conditions, the fluid must be
changed every 20,000 km or anyway every two
years.WARNING
ONLY USE DOT 4 CLASS BRAKE FLUIDS.COOLING SYSTEM FLUIDS ARE HIGHLY COR-ROSIVE. MAKE SURE THAT IT DOES NOTCOME INTO CONTACT WITH THE PAINT-WORK.CAUTION
MAKE SURE THE BRAKE FLUID DOES NOTGET INTO YOUR EYES OR ON YOUR SKIN ORCLOTHES. IF THIS HAPPENS ACCIDENTALLY,WASH WITH WATER.
Maintenance MP3 250 i.e.
MAIN - 12
Headlight adjustment
Proceed as follows:
1. Position the unloaded vehicle, in running order
and with the tyres inflated to the prescribed pres-
sure, on a flat surface 10 m away from a half-lit
white screen; ensure that the longitudinal axis of
the vehicle is perpendicular to the screen;
2. Remove the headlight assembly central cover
3. Turn on the headlight and check that the limit of
the projected light beam is not over 9/10 or below
7/10 of the distance from the ground to the centre
of the vehicle headlight;
4. Otherwise, adjust the headlight with the
screws«A» indicated in the figureN.B.
THE ABOVE PROCEDURE COMPLIES WITHTHE EUROPEAN STANDARDS REGARDINGMAXIMUM AND MINIMUM HEIGHT OF LIGHTBEAMS. REFER TO THE STATUTORY REGU-LATIONS IN FORCE IN EVERY COUNTRYWHERE THE vehicle IS USED.
MP3 250 i.e. Maintenance
MAIN - 13
Maintenance MP3 250 i.e.
MAIN - 14
INDEX OF TOPICS
TROUBLESHOOTING TROUBL
This section makes it possible to find what solutions to apply when troubleshooting.
For each breakdown, a list of the possible causes and respective interventions is given.
Engine
Excessive oil consumption/Exhaust smoke
EXCESSIVE CONSUMPTIONPossible Cause Operation
Wrong valve adjustment Adjust the valve clearance properlyOverheated valves Remove the head and the valves, grind or replace
the valvesMisshapen/worn valve seats Replace the head assembly
Worn cylinder, Worn or broken piston rings Replace the piston cylinder assembly or pistonrings
Worn or broken piston rings or piston rings thathave not been fitted properly
Replace the piston cylinder unit or just the pistonrings
Oil leaks from the couplings or from the gaskets Check and replace the gaskets or restore the cou-pling seal
Worn valve oil guard Replace the valve oil guardWorn valve guides Check and replace the head unit if required
Insufficient lubrication pressure
POOR LUBRICATION PRESSUREPossible Cause Operation
By-Pass remains open Check the By-Pass and replace if required. Care-fully clean the By-Pass area.
Oil pump with excessive clearance Perform the dimensional checks on the oil pumpcomponents
Oil filter too dirty Replace the cartridge filterOil level too low Restore the level using the recommended oil type
(Selenia HI Scooter 4 Tech)
Transmission and brakes
Clutch grabbing or performing inadequately
IRREGULAR CLUTCH PERFORMANCE OR SLIPPAGEPossible Cause Operation
Faulty clutch Check that there is no grease on the masses.Check that the clutch mass contact surface withthe casing is mainly in the centre with equivalentcharacteristics on the three masses. Check that
the clutch casing is not scored or worn in an anom-alous way
Troubleshooting MP3 250 i.e.
TROUBL - 2
Insufficient braking
INEFFICIENT BRAKING SYSTEMPossible Cause Operation
Inefficient braking system Check the pad wear (1.5 min). Check that thebrake discs are not worn, scored or warped. Checkthe correct level of fluid in the pumps and replacebrake fluid if necessary. Check there is no air in
the circuits; if necessary, bleed the air. Check thatthe front brake calliper moves in axis with the disc.
Fluid leakage in hydraulic braking system Failing elastic fittings, plunger or brake pumpseals, replace
Brake disc slack or distorted Check the brake disc screws are locked; measurethe axial shift of the disc with a dial gauge and with
wheel mounted on the scooter.
Brakes overheating
BRAKES OVERHEATINGPossible Cause Operation
Defective sliding of pistons Check calliper and replace any damaged part.Brake disc slack or distorted Check the brake disc screws are locked; use a dial
gauge and a wheel mounted on the vehicle tomeasure the axial shift of the disc.
Clogged compensation holes on the pump Clean carefully and blast with compressed airSwollen or glued rubber gaskets Replace gaskets.
Steering and suspensions
Heavy steering
STEERING HARDENINGPossible Cause Operation
Steering hardening Check the tightening of the top and bottom ringnuts. If irregularities continue in turning the steer-
ing even after making the above adjustments,check the seats in which the ball bearings rotate:if they are recessed or if the balls are squashed,
replace them.
Excessive steering play
EXCESSIVE STEERING CLEARANCEPossible Cause Operation
Torque not conforming Check the tightening of the top and bottom ringnuts. If irregularities continue in turning the steer-
ing even after making the above adjustments,check the seats in which the ball bearings rotate:
MP3 250 i.e. Troubleshooting
TROUBL - 3
Possible Cause Operationif they are recessed or if the balls are squashed,
replace them.
Noisy suspension
NOISY SUSPENSIONPossible Cause Operation
Malfunctions in the suspension system If the front suspension is noisy, check: the efficien-cy of the front shock absorbers; the condition ofthe ball bearings and relevant lock-nuts, the limitswitch rubber buffers and the movement bushings.In conclusion, check the tightening torque of the
wheel hub, the brake calliper, the shock absorberdisk in the attachment to the hub and the steering
tube.
Suspension oil leakage
OIL LEAKAGE FROM SUSPENSIONPossible Cause Operation
Seal fault or breakage Replace the shock absorber Check the conditionof wear of the steering covers and the adjust-
ments.
Troubleshooting MP3 250 i.e.
TROUBL - 4
INDEX OF TOPICS
ELECTRICAL SYSTEM ELE SYS
KEY
1. Immobilizer aerial
2. Injection ECU
3. Engine rev sensor
4. Magneto flywheel
5. Diagnostics socket
6. Voltage regulator
7. Key switch
8. Fuse-box
9. Fuse-box
10. Battery
11. Starter motor
12. Start up remote control switch
13. Starter button
14. Stop button on front brake
15. Stop button on rear brake
16. Helmet compartment light switch
17. Helmet compartment light switch
18. Helmet compartment light bulb
19. Saddle opener actuator
20. Saddle opening receiver
Electrical system MP3 250 i.e.
ELE SYS - 2
21. Preparation for anti-theft device
22. Turn indicator switch
23. Hazard switch
24. Turn indicator control device
25. Left rear turn indicator bulbs
26. Rear headlight assembly
A. Tail light
C. Stop light
27. License plate bulb
28. Right rear turn indicator bulbs
29. Left front turn indicator bulb
30. Front headlight assembly
A. Low-beam light bulb
B. Tail light
C. High-beam light bulb
31. Right front turn indicator bulb
32. Light switch
33. Remote control headlight
34. Horn remote control
35. Horn
36. Horn button
37. Pressure sensor
38. Locking/unlocking switch
39. Geared motor
40. Right tone wheel
41. Left tone wheel
42. Brake calliper sensor
43. Parking electronic control unit
44. Oil pressure sensor
45. Hand brake
46. Rider presence sensor
47. Potentiometer
48. Instrument panel
49. External temperature sensor
50. Fuel level transmitter
51. Electric fan
52. Remote control for electric fan
53. Injection load remote control
MP3 250 i.e. Electrical system
ELE SYS - 3
54. Engine stop switch
55. Mode button
56. Engine temperature sensor
57. Fuel pump
58. Fuel injector
59. Lambda probe
60. Spark plug
61. High voltage coil
Key
Ar: Orange Az: Sky blue Bi: White Bl: Blue Gi: Yellow Gr:Grey
Ma:Brown Ne: Black Ro: Pink Rs: Red Ve: Green Vi: Purple
Electrical system installation
Electrical system MP3 250 i.e.
ELE SYS - 4
MP3 250 i.e. Electrical system
ELE SYS - 5
Electrical system MP3 250 i.e.
ELE SYS - 6
MP3 250 i.e. Electrical system
ELE SYS - 7
Electrical system MP3 250 i.e.
ELE SYS - 8
MP3 250 i.e. Electrical system
ELE SYS - 9
Conceptual diagrams
Ignition
KEY
1. Immobilizer aerial
2. Injection ECU
3. Revolution sensor
7. Key switch
8. Fuse-box
9. Fuse-box
10. Battery
Electrical system MP3 250 i.e.
ELE SYS - 10
53. Injection load remote control
60. Spark plug
61. High voltage coil
Battery recharge and starting
KEY
2. Injection ECU
4. Magneto flywheel
6. Voltage regulator
7. Key switch
8. Fuse-box
9. Fuse-box
10. Battery
11. Starter motor
12. Start up remote control switch
13. Starter button
14. Stop button on front brake
15. Stop button on rear brake
26. Rear headlight assembly
B. Stop light
54. Engine stop switch
MP3 250 i.e. Electrical system
ELE SYS - 11
Level indicators and enable signals section
KEY
1. Immobilizer aerial
2. Injection ECU
3. Revolution sensor
7. Key switch
8. Fuse-box
9. Fuse-box
10. Battery
38. Locking/unlocking switch
39. Geared motor
40. Right tone wheel
41. Left tone wheel
42. Brake calliper sensor
43. Parking electronic control unit
44. Oil pressure sensor
45. Hand brake
46. Rider presence sensor
47. Potentiometer
48. Instrument panel
Electrical system MP3 250 i.e.
ELE SYS - 12
49. External temperature sensor
50. Fuel level transmitter
53. Injection load remote control
54. Engine stop switch
55. Mode button
56. Engine temperature sensor
57. Fuel pump
58. Fuel injector
59. Lambda probe
Devices and accessories
KEY
2. Injection ECU
7. Key switch
8. Fuse-box
9. Fuse-box
10. Battery
19. Saddle opening actuator
20. Saddle opening receiver
21. Wiring for antitheft device
34. Horn remote control
MP3 250 i.e. Electrical system
ELE SYS - 13
35. Horn
36. Horn button
37. Pressure sensor
43. Parking electronic control unit
51. Electric fan
52. Remote control for electric fan
Lights and turn indicators
KEY
7. Key switch
8. Fuse-box
9. Fuse-box
10. Battery
21. Wiring for antitheft device
22. Turn indicator switch
23. Hazard switch
24. Turn indicator control device
25. Left rear turn indicator bulbs
26. Rear headlight assembly
A. Tail light
B. Stop light
Electrical system MP3 250 i.e.
ELE SYS - 14
27. License plate bulb
28. Right rear turn indicator bulbs
29. Left front turn indicator bulb
30. Front headlight assembly
A. Low-beam light bulb
B. Tail light
C. High-beam light bulb
31. Right front turn indicator bulb
32. Light switch
33. Remote control headlight
43. Parking electronic control unit
48. Instrument panel
Checks and inspections
This section is devoted to the checks on the electrical system components.
Immobiliser
The electronic ignition system is controlled by the
control unit with the integrated Immobilizer sys-
tem. The immobilizer is an anti-theft system that
allows the scooter to be operated only when it is
started with coded keys recognised by the control
unit. The code is integrated in a transponder in the
key block. This allows the driver clear operation
without having to do anything other than just turn-
ing the key. The Immobiliser system consists of the
following components:
- Electronic control unit
- Immobilizer aerial
- Master key with incorporated transponder (red
key)
- service key with incorporated transponder (black
key)
- H.V. coil
- Diagnostic LED
The diagnostic LED also works as a deterring
blinker. This function is activated every time the
MP3 250 i.e. Electrical system
ELE SYS - 15
ignition switch is turned to the "OFF" position, or
the emergency stop switch is turned to the "OFF"
position. It remains activated for 48 hours in order
not to affect the battery charge. When the ignition
switch is turned to the "ON" position, the deterring
blinker function is deactivated. Subsequently, a
flash confirms the switching to the "ON" status.
The duration of the flash depends on the program-
ming of the electronic control unit If the LED is off
regardless of the position of the ignition-key switch
and/or the instrument panel is not initiated, check:
• there is battery voltage
• fuses 6,7,10 are in working order
• there is power to the control unit as
specified below:
Remove the connector support bracket shown in
the photograph and disconnect the connector from
the control unit. Check the following conditions:
With the key switch set to OFF:
• if there is battery voltage between ter-
minals 6-26 and terminal 6-chassis
ground (fixed power supply). If there is
no voltage check that fuse 6 and its ca-
ble are in working order.
With the key switch in the OFF position:
• there is battery voltage between termi-
nals 5-26 and terminal 5-frame earth
(fixed power supply). If there is no volt-
age, check the key switch contacts,
that fuse no. 10 and its cable are work-
ing order.
Electrical system MP3 250 i.e.
ELE SYS - 16
• There is continuity between terminals
12-18 and 12-19 with the emergency
cut-out switch in the RUN position. If
there is no continuity check the con-
tacts of the latter.
If no faults are found, replace the electronic control
unit.
After removing the shield back plate, remove the
electrical connection from the aerial as shown in
the photograph
Remove the protective base from the connector.
With the ignition key switch at ON check there is
battery voltage between the Red-White and Black
cables
MP3 250 i.e. Electrical system
ELE SYS - 17
With MIU connector disconnected check the con-
tinuity between the Orange-White cable and pin 7
of the interface wiring .
Specific tooling020481Y Control unit interface wiring
020331Y Digital multimeter
Virgin circuitWhen the ignition system is not encrypted, any key will start the engine but limited to 2000 rpm. The
keys can only be recognised if the control unit has been programmed properly. The data storage pro-
cedure for a previously not programmed control unit provides for the recognition of the master as the
first key to be stored to memory: this becomes particularly important because it is the only key that
enables the control unit to be wiped clean and reprogrammed for the memorisation of the service keys.
The master and service keys must be used to code the system as follows:
- Insert the Master key, turn it to «ON» and keep this position for two seconds (lower and upper limits
1 to 3 seconds).
- Insert the service key and turn it to "ON" for 2 seconds.
- If you have copies of the key, repeat the operation with each key.
- Insert the MASTER key again and turn it to "ON" for 2 seconds.
The maximum time to change keys is 10 seconds.
During a single data storage sequence a maximum of 7 service keys are allowed.
It is essential to adhere to the times and the procedure. If you do not, start again from the beginning.
Once the system has been programmed, master key transponder, decoder and control unit are strictly
matched. With this link established, it is now possible to encode new service keys, in the event of losses,
replacements, etc. Each new programming deletes the previous one so, in order to add or eliminate
keys, you must repeat the procedure using all the keys you intend to keep using. If a service key should
become un-coded, the efficiency of the high voltage circuit shielding must be thoroughly inspected: In
any case it is advisable to use resistive spark plugs.
Electrical system MP3 250 i.e.
ELE SYS - 18
CharacteristicMASTER key:
RED KEY
SERVICE key.
BLACK KEY
Diagnostic codes
The immobiliser system is tested each time the ig-
nition-key switch is turned from OFF to ON. During
this diagnosis phase a number of control unit sta-
tuses can be seen and various light codes dis-
played. Regardless of the code transmitted, if at
the end of the diagnosis the led remains off per-
manently, the ignition is enabled. If, however, the
led remains on permanently, it means the ignition
is inhibited:
1. Previously unused control unit - key inser-
ted: a single 2 second flash is displayed, after
which the LED remains off permanently. The keys
can be stored to memory, the vehicle can be star-
ted but with a limitation imposed on the number of
revs.
2. Previously unused control unit - transpond-
er absent or cannot be used: The LED is per-
manently ON; in this condition, no operations are
possible, including starting of the vehicle.
3. Programmed control unit - the service key in
(normal condition of use): a single 0.7 second
flash is displayed, after which the LED remains off
permanently. The engine can be started.
4. Programmed control unit - Master key in: a
0.7 sec. flash is displayed followed by the LED re-
maining off for 2 sec. and then by short 0.46 sec.
flashes the same number of times as there are
keys stored in the memory including the Master
key. When the diagnosis has been completed, the
MP3 250 i.e. Electrical system
ELE SYS - 19
LED remains permanently OFF. The engine can
be started.
5. Programmed control unit - fault detected: a light code is displayed according to the fault detected,
after which the LED remains on permanently. The engine cannot be started. The codes that can be
transmitted are:
• Code 1 flash
• 2 flash code
• 3 flash code
Diagnostic code - 1 flash
The one-flash code indicates a system where the
serial line is not present or is not detected. Check
the Immobiliser aerial wiring and change it if nec-
essary.
Diagnostic code - 2 flashes
Two-flash code shows a system where the control
unit does not show the transponder signal. This
might depend on the inefficiency of the immobiliser
aerial or the transponder.
Turn the switch to ON using several keys: if the
code is repeated even with the Master key, check
the aerial wiring and change it if necessary. If this
is not the case, replace the defective key and/or
reprogram the control unit. Replace the control unit
if the problem continues.
Electrical system MP3 250 i.e.
ELE SYS - 20
Diagnostic code - 3 flashes
The three-flash code indicates a system where the
control unit does not recognise the key. Turn the
switch to ON using several keys: if the error code
is repeated even with the Master key, replace the
control unit. If this is not the case, perform a re-
programming.
Battery recharge circuit
The recharge system is provided with a three-phase alternator with permanent magneto flywheel.
The alternator is directly connected to the voltage regulator.
This, in its turn, is connected directly to the ground and the battery positive terminal passing through
the 30A protective fuse.
The three- phase generator provides good recharge power and at low revs, a good compromise is
achieved between generated power and idle stability.
Stator check
Stator winding check-upWARNING
THE CHECK-UP CAN BE MADE WITH THE STATOR PROPERLY INSTALLED.
1 Remove the right side panel.
2) Disconnect the connector between stator and regulator with the three yellow cables as shown in the
photograph.
3) Measure the resistance between each of the yellow terminals and the other two.
Electric characteristicResistance:
0.2 - 1 Ω
MP3 250 i.e. Electrical system
ELE SYS - 21
4) Check that there is insulation between the each
yellow cable and the ground.
5) If values are incorrect, replace the stator.
Recharge system voltage check
Look for any leakage
1) Access the battery by removing its cover under the saddle.
2) Check that the battery does not show signs of losing fluid before checking the output voltage.
3) Turn the ignition key to position OFF, connect the terminals of the tester between the negative pole
(-) of the battery and the black cable and only then disconnect the black cable from the negative pole
(-) of the battery.
4) With ignition key still at OFF, the reading detected by the ammeter must be ≤ 0.5 mA.
Check the charging currentWARNING
BEFORE CARRYING OUT THE CHECK, MAKE SURE THAT THE BATTERY IS IN GOOD WORK-ING ORDER.
1) Place the vehicle on its centre stand
2) With the battery correctly connected to the circuit, place the tester terminals between the battery
terminals..
3) Turn on the engine, increase the revs and, at the same time, measure the voltage.
Electric characteristicVoltage ranging between 14.0 and 15.0V at 5000 rpm.
Maximum current output check.
- With the engine off and the panel at «ON» with the lights on, allow the battery voltage to stop at 12V.
- Connect ammeter pliers to the 2 recharge positive poles in output from the regulator.
- Start the engine and rev it up to a high engine speed while reading the value on the pincer.
With an efficient battery a value must be detected: > 20A
VOLTAGE REGULATOR/RECTIFIERSpecification Desc./Quantity
Type Non-adjustable three-phase transistorVoltage 14 ÷ 15V at 5000 rpm with lights off
Electrical system MP3 250 i.e.
ELE SYS - 22
Fuses
The electrical system has twelve fuses divided in
two fuse boxes to protect the different installation
circuits. One of them is inside the battery compart-
ment and the other is at the right internal side of
the footrest. To be able to reach, loosen the screw
"A" and remove the plastic cover. The chart shows
the position and characteristics of the fuses in the
vehicle.CAUTION
BEFORE REPLACING THE BLOWN FUSE,FIND AND SOLVE THE FAILURE THATCAUSED IT TO BLOW. NEVER TRY TO RE-PLACE THE FUSE WITH ANY OTHER MATERI-AL (E.G., A PIECE OF ELECTRIC WIRE).
FUSE TABLE
Specification Desc./Quantity1 Fuse No. 1 Capacity: 30A
Protected circuits:Voltage regulatorLocation:battery compartment
2 Fuse No. 2 Capacity: 20AProtected circuits:battery-powered fuse
No. 7, live fuses No. 8 - No. 9 - No.10 - No.11
Location:battery compartment3 Fuse No. 3 (if present) Capacity: 20A
Protected circuits:parking control ECULocation:battery compartment
4 Fuse No. 4 Capacity: 15 AProtected circuits:Battery-powered saddleopening switch, glove-box lighting, headlight,
emergency turn indicatorLocation:battery compartment
5 Fuse No. 5 Capacity: 15 AProtected circuits:Battery-powered injec-
tion loads, electrical fanLocation:battery compartment
6 Fuse No. 6 Capacity: 3AProtected circuits:Battery-powered injec-
tion control unitLocation:battery compartment
MP3 250 i.e. Electrical system
ELE SYS - 23
Specification Desc./Quantity7 Fuse No. 7 Capacity: 7.5 A
Protected circuits:Battery-powered instru-ment panel
Location:footrest8 Fuse No. 8 Capacity: 10A
Protected circuits:Live stop and start lightsLocation:footrest
9 Fuse No. 9 Capacity: 7.5 AProtected circuits:live passing and horn
Location:battery compartment10 Fuse No. 10 Capacity: 7.5A
Protected circuits:Live injection, electricalfan remote control antenna, injection loads
remote controlLocation:footrest
11 Fuse No. 11 Capacity: 7.5AProtected circuits:Live ECU parking lever,antitheft device, instrument panel, headlight
remote control, horn remote controlLocation:footrest
12 Fuse No. 12 Capacity: 7.5AProtected circuits:Live turn indicator, sad-dle opening switch, tail lights, panel lighting
Location:footrest
Dashboard
A = Led immobilizer / anti-theft device
B= Speedometer with twin scale (km/h and mph)
C = CLOCK switch
D = Digital display
E = Front suspension locking system warning light (if available)
F = SET switch
G = Rpm indicator
H = Fuel gauge
I = Warning light for helmet compartment courtesy light on
L = Engine control telltale light and injection system failure warning light
M = Low fuel warning light
N = Engine stop warning light
D= Turn indicator warning light
P = Low oil pressure warning light
Q = Front suspension locking system failure warning light (if available)
R = Warning light for parking brake engaged
C = High-beam warning light
Electrical system MP3 250 i.e.
ELE SYS - 24
A = Total odometer gauge
B = «BELT» maintenance icon
C = «SERVICE» maintenance icon
D = Engine coolant temperature indicator
E = Trip odometer gauge (A-B) and ambient tem-
perature (selected with the MODE button)
F = TIME-DATE indicator
G = Low fuel warning light
H = Trip odometer gauge (B)
I = Trip odometer gauge (A)
L = Kilometre - mile indicator
Sealed battery
If the vehicle is provided with a sealed battery, the only maintenance required is the check of its charge
and recharging, if necessary.
These operations should be carried out before delivering the vehicle, and on a six-month basis while
the vehicle is stored in open circuit.
Besides, upon pre-delivery it is therefore necessary to check the battery charge and recharge it, if
required, before storing the vehicle and, afterwards, every six months.
INSTRUCTIONS FOR THE RENEWAL RECHARGE AFTER OPEN-CIRCUIT STORAGE
1) Voltage check up
Before installing the battery on the vehicle, check the open circuit voltage with a regular tester.
- If voltage exceeds 12.60 V, the battery can be installed without any renewal recharge.
- If voltage is below 12.60 V, a renewal recharge is required as explained in 2).
2) Constant voltage battery charge mode
- Constant voltage charge equal to 14.40 ÷ 14.70V
MP3 250 i.e. Electrical system
ELE SYS - 25
-Initial charge voltage equal to 0.3 ÷ 0.5 for Nominal capacity
- Charge time:
10 to 12 h recommended
Minimum 6 h
Maximum 24 h
3) Constant current battery charge mode
- Charge current equal to 1/10 of the battery rated capacity
- Charge time: Maximum 5 h
Connectors
1A Alimentazione potenziometro
2A Linea CAN
3A Alimentazione spie
4A Spia blocco rollio
5A Spia warning
6A Uscita teleruttore anabbaglianti
7A Massa potenziometro
8A Massa centralina
1B Alimentazione da chiave
2B Linea CAN
3B Sensore giri ruota SX
4B Sensore giri ruota DX
5B Segnale potenziometro
6B Pulsante comando bolocco - sblocco rollio
7B Teleruttore claxon (allarme)
8B Uscita (A) motore elettro-attuatore
1C Alimentazione da batteria
2C Linea "K"
3C Pulsante comando bolocco - sblocco rollio
4C Pulsante pinza rollio
5C Pulsante comando bolocco - sblocco rollio
6C Sensore presenza pilota
7C Segnale di velocita per il gruppo strumenti
8C Uscita (B) motore elettro-attuatore
Electrical system MP3 250 i.e.
ELE SYS - 26
Dashboard
1/20 Sensore velocità
2/20 Segnale livello carburante
3/20 Sensore temperatura liquido di raffreddamento
4/20 Massa sensore temperatura liquido di raffreddamento
5/20 Pulsante mode remoto
6/20 Spia pressione olio
7/20 Spia lampeggiatore sinistro
8/20 Spia lampeggiatore destro
9/20 Spia luce abbagliante
10/20 Spia bauliera aperta
11/20 Sensore giri
12/20 Sensore temperatura ambiente
13/20 Massa sensore temperatura ambiente
14/20 Spia motore inibito
15/20 Spia immobilizer
16/20 Spia controllo motore
17/20 Spia freno di stazionamento
18/20 Spia blocco rollio attivato
19/20 Spia avaria sistema blocco rollio
20/20 Positivo sotto chiave dalla centralina comando di stazionamento
5/12 Illuminazione
6/12 Positivo batteria
11/12 Massa
12/12 Positivo sotto chiave
Remote seat opening
MP3 250 i.e. Electrical system
ELE SYS - 27
Zeroing
- Remove the left side fairing to access the saddle
opening receiver control unit indicated in the pho-
tograph
- Remove the metal terminal and connect it to a
good earth point, or to terminal 7 (black), for at
least 10 seconds.
- In this operation all the remote controls stored in
the control unit will be deleted.WARNING
THE CONTROL UNIT CAN PROGRAMME UPTO 8 REMOTE CONTROLS.
Programming
Follow these steps to program the remote controls:
1. Insert the remote control key to be programmed in the steering lock key block.
2. Turn the key to «ON», press the button on the remote control, release the button, turn the key back
to «OFF» from the «ON» position, all within 4 seconds.
3 Wait 1 to 8 seconds.
4. Repeat steps 2 and 3 for 4 times without removing the key.
The control unit confirms the programming has been successfully executed by opening the saddle.WARNING
TO STORE THE OTHER REMOTE CONTROLS TO MEMORY, (MAXIMUM 8), YOU NEED TO RE-PEAT THE WHOLE PROCEDURE AGAIN. FAILURE TO CARRY OUT THESE OPERATIONSWITHIN THE INDICATED TIMES WILL RESULT IN THE AUTOMATIC CANCELLATION OF THEPROCESS FOR PROGRAMMING THE REMOTE-CONTROLLED KEYS.WARNING
AVOID PRESSING THE REMOTE CONTROL BUTTON MORE THAN ONCE WHEN FAR AWAYFROM THE SCOOTER. THE SYNCHRONISM BETWEEN THE REMOTE CONTROL AND THE RE-CEIVER CAN BE IMPAIRED. SHOULD THIS BE THE CASE, REPEAT THE PROGRAMMINGPROCEDURE. DO NOT KEEP THE REMOTE CONTROL IN PLACES WITH TEMPERATURES EX-CEEDING 60° C THE BATTERY WILL RUN DOWN TOO QUICKLY.WARNING
Electrical system MP3 250 i.e.
ELE SYS - 28
TO AVOID BATTERY DISCHARGE, THE SADDLE OPENING REMOTE CONTROL RADIO RE-CEIVER DEACTIVATES 7 DAYS AFTER THE LAST TIME THE VEHICLE WAS SHUT OFF.JUST TURN THE KEY TO «ON» TO REACTIVATE THE RECEIVER.
MP3 250 i.e. Electrical system
ELE SYS - 29
Electrical system MP3 250 i.e.
ELE SYS - 30
INDEX OF TOPICS
ENGINE FROM VEHICLE ENG VE
This section describes the operations to carry out when removing the engine from the vehicle.
Exhaust assy. Removal
- Remove the Lambda probe from its support and
disconnect it.
- Undo the two exhaust manifold fixings on the
head. To undo the nuts fixing the muffler flange to
the head properly, you must use a jointed wrench
that enables you to get at the right nut as well, ac-
cording to the direction of travel, that is difficult to
get at with a traditional straight wrench.
- Undo the three screws fixing the muffler to the
support arm.
Remove the full muffler unit.
Remove the lambda probe from the manifold.
Engine from vehicle MP3 250 i.e.
ENG VE - 2
CAUTION: SHOULD IT BE NECESSARY TO REMOVE ONLY THE MUFFLER TIP, ALWAYS RE-
PLACE THE GRAPHITE GASKET BETWEEN STUB AND TIP.
Removal of the engine from the vehicle
- Disconnect the battery
- Remove the engine cover inside the helmet com-
partment
- Remove the side panels
Remove the full muffler assembly.CAUTION
THIS OPERATION MUST BE CARRIED OUTWHEN THE ENGINE IS COLD.
- Remove the rear wheel.
- Remove the pipe feeding coolant into the pump
as shown in the photograph and then empty the
system.
- Remove the engine coolant outlet pipe as indi-
cated.
- Disconnect the fuel delivery and return pipes from
the injector by removing the screw locking the re-
taining clip.
- Disconnect the injector wiring and the throttle
body control unit wiring.
MP3 250 i.e. Engine from vehicle
ENG VE - 3
- Remove the coolant outlet pipe from the motor
as indicated.
- Remove the spark plug caps.
- Remove the coolant temperature sensor con-
nector indicated in the photo.
- Remove the throttle cable from the throttle body
by undoing the nut shown in the photo.
- Remove the positive and negative wiring from the
starter motor as shown in the photo.
Engine from vehicle MP3 250 i.e.
ENG VE - 4
- Disconnect the connectors from the flywheel wir-
ing as shown in the photo.
- Remove the cable from the retaining clip on the
flywheel cover.
Remove the lower screw of the left-hand shock
absorber.
- Use a jack to support the vehicle properly. Re-
move the engine-swinging arm fixing pin by undo-
ing the nut and the head of the pin as shown in the
photograph.
- The engine is now free.
When refitting the engine onto the scooter, carry out the removal operations but in reverse order and
respect the tightening torques shown in the Specifications Chapter.
-Check the engine oil level and if necessary top it up with the recommended type.
- Fill and bleed the cooling circuit.
- Check the functioning of the accelerator and the electrical devices.CAUTION
MP3 250 i.e. Engine from vehicle
ENG VE - 5
PAY PARTICULAR ATTENTION TO POSITIONING THE THROTTLE COMMAND TRANSMISSIONPROPERLY.
Engine from vehicle MP3 250 i.e.
ENG VE - 6
INDEX OF TOPICS
ENGINE ENG
This section describes the operations to be carried out on the engine and the tools to be used.
Automatic transmission
Transmission cover
- To remove the transmission cover it is necessary
to remove the plastic cover first, by inserting a
screwdriver in the slotted holes. Using the clutch
bell lock wrench shown in the figure, remove the
driven pulley shaft locking nut and washer.
Specific tooling020423Y driven pulley lock wrench
- Remove the cap/dipstick from the engine oil filling
hole.
- Remove the ten screws.
- Remove the transmission cover.N.B.
WHEN YOU ARE REMOVING THE TRANSMIS-SION COVER YOU MUST BE CAREFUL NOTTO DROP THE CLUTCH BELL.
Air ductVersione 250
- Remove the five screws on two different levels
as well as the small casing.
Engine MP3 250 i.e.
ENG - 2
- To remove the intake throat on the transmission
cover, just remove the 2 fixing screws indicated in
the figure.
Removing the driven pulley shaft bearing
- Remove the clip from the inside of the cover.
- Remove the bearing from the crankcase by
means of:
Specific tooling020376Y Adaptor handle
020375Y Adaptor 28 x 30 mm
020412Y 15 mm guide
Refitting the driven pulley shaft bearing
- Slightly heat the crankcase from the inside so as
not to damage the painted surface.
- Insert the bearing in its seat.
- Refit the seeger ring.CAUTION
USE AN APPROPRIATE REST SURFACE TOAVOID DAMAGING THE COVER PAINT.N.B.
ALWAYS REPLACE THE BEARING WITH ANEW ONE UPON REFITTING.
Specific tooling020376Y Adaptor handle
020357Y 32 x 35 mm adaptor
020412Y 15 mm guide
Baffle roller
MP3 250 i.e. Engine
ENG - 3
Plastic roller
- Check that the roller does not show signs of wear
and that it turns freely.
- Remove the special clamping screws as indica-
ted in the photograph
- Check the outer diameter of the roller does not
have defects that could jeopardise belt functioning
- For refitting, place the roller with the belt contain-
ment edge on the engine crankcase side
- Tighten the wrench to the prescribed torque.
Locking torques (N*m)Anti-flapping roller 12 - 16
Removing the driven pulley
- Remove the clutch bell housing and the driven
pulley assembly.N.B.
THE UNIT CAN ALSO BE REMOVED WITH THEDRIVING PULLEY MOUNTED.
Engine MP3 250 i.e.
ENG - 4
Inspecting the clutch drum
- Check that the clutch bell is not worn or damaged.
- Measure the clutch bell inside diameter.
CharacteristicMax. value clutch bell
Max. value: Ø 134.5 mm
Clutch bell standard value
Standard value: Ø 134 - 134.2 mm
Checking the bell working surface eccentricity
- Install the bell on a driven pulley shaft using 2
bearings (inner diameter 15 and 17 mm).
- Lock with the original spacer and nut.
- Place the bell/shaft assembly on the support to
check the crankshaft alignment.
- Using a feeler pin gauge and the magnetic base,
measure the bell eccentricity.
- Repeat the measurement in 3 positions (Central,
internal, external).
- If faults are found, replace the bell.
Specific tooling020074Y Support base for checking crankshaftalignment
020335Y Magnetic support for dial gauge
Characteristicclutch bell inspection: Limit eccentricity.
Admissible limit eccentricity: 0.15 mm
MP3 250 i.e. Engine
ENG - 5
Removing the clutch
Fit the driven pulley spring compressor specific
tool with medium length pins screwed in position
«C» on the tool internal side.
- Introduce the adapter ring No. 11 with the cham-
fering facing the inside of the tool.
- Fit the driven pulley unit on the tool with the in-
sertion of the 3 pins in the ventilation holes in the
mass holder support.
- Make sure that the clutch is perfectly inserted into
the adapter ring before proceeding to loosen/tight-
en the clutch nut.
- Use the special 46x55 wrench component No. 9
to remove the nut fixing the clutch in place.
- Dismantle the driven pulley components (Clutch
and spring with its plastic holder)CAUTION
THE TOOL MUST BE FIRMLY FIXED IN THECLAMP AND THE CENTRAL SCREW MUST BEBROUGHT INTO CONTACT WITH THE TOOL.EXCESSIVE TORQUE CAN CAUSE THE SPE-CIFIC TOOL TO BUCKLE.
Specific tooling020444Y011 adapter ring
020444Y009 46x55 Wrench
020444Y Tool for fitting/ removing the drivenpulley clutch
Inspecting the clutch
- Check the thickness of the clutch mass friction
material.
- The masses must not show traces of lubricants;
otherwise, check the driven pulley unit seals.N.B.
UPON RUNNING-IN, THE MASSES MUST EX-HIBIT A CENTRAL CONTACT SURFACE ANDMUST NOT BE DIFFERENT FROM ONE AN-OTHER.VARIOUS CONDITIONS CAN CAUSE THECLUTCH TO TEAR.CAUTION
Engine MP3 250 i.e.
ENG - 6
DO NOT OPEN THE MASSES USING TOOLSTO PREVENT A VARIATION IN THE RETURNSPRING LOAD.
CharacteristicCheck minimum thickness
1 mm
Pin retaining collar
- Simultaneously turn and pull the collar manually
to remove it.N.B.
USE TWO SCREWDRIVERS IF YOU HAVE DIF-FICULTY.N.B.
BE CAREFUL NOT TO PUSH THE SCREWDRIVERS IN TOO FAR TO AVOID DAMAGETHAT COULD ENDANGER THE O-RING SEAL.
- Remove the four torque server pins and pull the
pulley halves apart.
Removing the driven half-pulley bearing
- Check there are no signs of wear and/or noisi-
ness; - Replace with a new one if there are.
- Remove the retaining ring using two flat blade
screwdrivers.
- Support the pulley bushing adequately from the
threaded side using a wooden surface.
- Using a hammer and pin, knock the ball bearing
out as shown in the figure.
MP3 250 i.e. Engine
ENG - 7
- Support the pulley properly using the bell as
shown in the figure.
Specific tooling001467Y035 Belle for OD 47-mm bearings
- Remove the roller bearing using the modular punch.
Specific tooling020376Y Adaptor handle
020456Y Ø 24 mm adaptor
020363Y 20 mm guide
Inspecting the driven fixed half-pulley
Version 250
- Measure the outer diameter of the pulley bushing.
- Check the contact surface with the belt to make
sure there are no flaws.
- Check the riveted joints are functional.
- Check the evenness of the belt contact surface.
CharacteristicHalf-pulley minimum diameter
Minimum admissible diameter Ø 40.96 mm
Half-pulley standard diameter
Standard diameter: Ø 40.985 mm
Wear limit
0.3 mm
Engine MP3 250 i.e.
ENG - 8
Inspecting the driven sliding half-pulley
- Remove the two internal grommets and the two
O-rings.
- Measure the movable half-pulley bushing inside
diameter.
- Check the contact surface with the belt to make
sure there are no flaws.
- Check the riveted joints are functional.
- Check the evenness of the belt faying surface.
MOVABLE DRIVEN HALF-PULLEY DIMENSIONSSpecification Desc./Quantity
Wear limit 0.3 mmstandard diameter Diameter 41.000 - 41.035 mm
maximum allowable diameter Ø 41.08 mm
Refitting the driven half-pulley bearing
- Support the pulley bushing adequately from the
threaded side using a wooden surface.
- Fit a new roller sleeve as in the figure.
- For the fitting of the new ball bearing, follow the
example in the figure using a modular punch.
Fit the retention ringWARNINGN.B.
FIT THE BALL BEARING WITH THE VISIBLESHIELD
Specific tooling020376Y Adaptor handle
020375Y Adaptor 28 x 30 mm
020424Y Driven pulley roller casing fittingpunch
MP3 250 i.e. Engine
ENG - 9
Refitting the driven pulley
- Insert the new oil guards and O-rings on the mov-
able half-pulley.
- Lightly grease the O-rings «A» shown in the fig-
ure.
- Fit the half-pulley over the bushing using the spe-
cific tool.
- Check that the pins are not worn and proceed to
refitting them in their slots.
- Refit the torque server closure collar.
- Using a curved-spout grease gun, lubricate the
driven pulley unit with approximately 6 gr. of
grease. Apply the grease through one of the holes
in the bushing until it comes out through the hole
on the opposite side. This operation is necessary
to avoid the presence of grease beyond the O-
rings.N.B.
THE TORQUE SERVER CAN BE GREASEDWHETHER WITH BEARINGS FITTED ORWHEN THEY ARE BEING REPLACED; UNDER-TAKING THE OPERATION WHEN THE BEAR-INGS ARE BEING SERVICED MIGHT BE EAS-IER.
Specific tooling020263Y Sheath for driven pulley fitting
Recommended productsAGIP GREASE SM 2 Grease for the tone wheelrevolving ring
Engine MP3 250 i.e.
ENG - 10
Soap-based lithium grease containing NLGI 2 Mo-
lybdenum disulphide; ISO-L-XBCHB2, DIN
KF2K-20
Inspecting the clutch spring
- Measure the length of the spring, while it is re-
laxed.
CharacteristicStandard length
123 mm
acceptable limit after use:
118 mm
Refitting the clutch
- Support the driven pulley spring compressor ap-
propriate tool with the control screw in vertical axis.
- Arrange the tool with the medium length pins
screwed in position "C" on the inside.
- Introduce the adapter ring No. 11 with the cham-
fering facing upwards.
- Insert the clutch on the adapter ring.
- Lubricate the end of the spring that abuts against
the servo-system closing collar.
- Insert the spring with its plastic holder in contact
with the clutch.
- Insert the driving belt into the pulley unit accord-
ing to their direction of rotation.
- Insert the pulley unit with the belt into the tool.
- Slightly preload the spring.
- Make sure that the clutch is perfectly inserted into
the adapter ring before proceeding to tighten the
clutch nut.
- Place the tool in the clamp with the control screw
on the horizontal axis.
- Fully preload the spring.
MP3 250 i.e. Engine
ENG - 11
- Apply the clutch fixing nut and tighten it to the
prescribed torque using the special 46x55 wrench.
- Loosen the tool clamp and insert the belt accord-
ing to its direction of rotation.
- Lock the driven pulley again using the specific
tool.
- Preload the clutch return spring with a traction/
rotation combined action and place the belt in the
smaller diameter rolling position.
- Remove the driven pulley /belt unit from the tool.N.B.
DURING THE SPRING PRELOADING PHASE,BE CAREFUL NOT TO DAMAGE THE PLASTICSPRING STOP AND THE BUSHING THREAD-ING.N.B.
FOR DESIGN REASONS, THE NUT IS SLIGHT-LY ASYMMETRIC; THE FLATTEST SURFACESHOULD BE MOUNTED IN CONTACT WITHTHE CLUTCH.
Specific tooling020444Y Tool for fitting/ removing the drivenpulley clutch
020444Y011 adapter ring
020444Y009 46x55 Wrench
Locking torques (N*m)Clutch unit nut on driven pulley 45 ÷ 50
Refitting the driven pulley
- Refit the clutch bell.
Engine MP3 250 i.e.
ENG - 12
Drive-belt
- Check that the driving belt is not damaged.
- Check the width of the belt.
Characteristic250 4T Transmission belt/minimum width
19.5 mm
250 4T Transmission belt/standard width
21.3 ± 0.2 mm
During the wear checks in the scheduled servicing
programme, you are advised to check the rim bot-
tom of the toothing does not show signs of inci-
sions or cracking (see figure): The rim bottom of
the tooth must not have incisions or cracking; if it
does, change the belt.
Removing the driving pulley
- Turn the crankshaft until the ropes of the pulley
are on a horizontal axis
- Insert the adaptor sleeve of the appropriate tool
in the hole shown in the photograph
MP3 250 i.e. Engine
ENG - 13
- Insert the tool in the hollows and apply the reten-
tion ring
- Bring in the ring's clamping screws while keeping
the tool to support the pulley
Specific tooling020626Y Driving pulley lock wrench
- Remove the fixing nut and the washer
- Remove the stationary drive pulley half.
Inspecting the rollers case
- Check that the internal bushing shown in the fig-
ure is not abnormally worn and measure inner
diameter A.
- Measure outer diameter B of the pulley sliding
bushing shown in the figure.
- Check that the rollers are not damaged or worn.
- Check the guide shoes for the variator back-plate
are not worn.
- Check the wear of the roller housings and of the
belt contact surfaces on both pulley halves.
- Check that stationary driving pulley does not
show signs of abnormal wear on the grooved edge
and on the surface in contact with the belt.
- Check that the O-ring is not pushed out of shape.CAUTION
DO NOT LUBRICATE OR CLEAN SINTEREDBUSHINGS
CharacteristicMovable driving half-pulley bushing: StandardDiameter
Engine MP3 250 i.e.
ENG - 14
26.000 - 26.021 mm
Movable driving half-pulley bushing: Maxi-mum allowable diameter
Ø 26.12 mm
Sliding bushing: Standard Diameter
Ø 25.959 ÷ 25.98 mm
Sliding bushing: Minimum admissible diame-ter
Ø 25.95 mm
Roller: Standard Diameter
Diameter 20.5 - 20.7 mm
Roller: Minimum diameter permitted
Ø 20 mm
Refitting the driving pulley
- Preassemble the movable half-pulley with the
roller contrast plate by putting the rollers in their
housings with the larger support surface touching
the pulley according to the direction of rotation.
- Check that the roller contact plate does not have
flaws and is not damaged on the grooved edge.
- Mount the complete bushing unit on the driving
shaft.
- Fit the driven pulley/Clutch/belt unit on the en-
gine.
MP3 250 i.e. Engine
ENG - 15
- Fit the steel shim in contact with the bushing and
the stationary drive pulley.
- Install the appropriate tool as described in the re-
moval phase.
-Tighten the nut with washer to the prescribed tor-
que.
Specific tooling020626Y Driving pulley lock wrench
Locking torques (N*m)Drive pulley nut 75 ÷ 83
Refitting the transmission cover
- Check the presence of the 2 centring dowels and
the correct installation of the sealing gasket for the
oil sump on the transmission cover.
- Replace the cover tightening the 10 screws at the
specified torque.
- Refit the oil loading cap/bar.
- refit the steel washer and the driven pulley nut.
- Tighten the nut to the prescribed torque using the
lock wrench and the torque wrench tools.
- Replace the plastic cover.
Specific tooling020423Y driven pulley lock wrench
Locking torques (N*m)Transmission cover screws 11 ÷ 13 Driven pul-ley shaft nut 54 ÷ 60
End gear
Engine MP3 250 i.e.
ENG - 16
Removing the hub cover
- Empty the rear hub through the oil drainage plug.
- Remove the 7 flanged screws indicated in the
figure.
- Remove the hub cover and its gasket.
Removing the wheel axle
- Remove the wheel axis complete with gear.
- Remove the intermediate gear.
MP3 250 i.e. Engine
ENG - 17
Removing the hub bearings
- Check the state of the bearings being examined
(wear, clearance and noisiness). If faults are de-
tected, do the following.
- Use the specific bearing extractor to remove the
three 15 mm bearings (2 in the crankcase and 1 in
the hub cover).
Specific tooling001467Y013 Pliers to extract ø 15-mm bearings
Removing the wheel axle bearings
- Take out the clip on the outside of the gearbox
cover.
- Support the hub cover and expel the bearing.
By means of the appropriate tools, remove the oil
guard as in the figure.
Specific tooling020376Y Adaptor handle
020477Y Adaptor 37 mm
020483Y 30 mm guide
020359Y 42x47-mm adaptor
020489Y Hub cover support stud bolt set
Engine MP3 250 i.e.
ENG - 18
Removing the driven pulley shaft bearing
- As you need to remove the driven pulley shaft, its
bearing and oil guard, remove the transmission
cover as described above.
- Extract the driven pulley shaft from its bearing.
- Remove the oil guard using a screwdriver, work-
ing from inside the bearing and being careful not
to damage the housing, make it come out of the
belt transmission side.
- Remove the seeger ring shown in the figure
Remove the driven pulley shaft bearing using the
modular punch.
Specific tooling020376Y Adaptor handle
020375Y Adaptor 28 x 30 mm
020363Y 20 mm guide
Inspecting the hub shaft
- Check the three shafts for wear or distortion of
the toothed surfaces, the bearing housings, and
the oil seal housings.
- In case of anomalies, replace the damaged com-
ponents.
Inspecting the hub cover
- Check that the fitting surface is not dented or distorted.
- Check the bearing bearings.
- In case of anomalies, replace the damaged components.
MP3 250 i.e. Engine
ENG - 19
Refitting the wheel axle bearing
- Support the hub cover on a wooden surface.
- Heat the crankcase cover with the specific heat
gun.
- Fit the wheel shaft bearing with a modular punch
as shown in the figure.
- Fit the seeger ring.
- Fit the oil guard with seal lip towards the inside
of the hub and place it flush with the internal sur-
face by means of the appropriate tool used from
the 52 mm side.
The 52 mm side of the adapter must be turned to-
wards the bearing.
Specific tooling020376Y Adaptor handle
020360Y Adaptor 52 x 55 mm
020483Y 30 mm guide
Engine MP3 250 i.e.
ENG - 20
Refitting the hub cover bearings
For the fitting of the hub box bearings the engine
crankcase and the cover must be heated with the
special heat gun.
- The three 15 mm bearings must be fitted using
the appropriate tools.
- The 42-mm side of the adapter must be turned
towards the bearing.
Specific tooling020150Y Air heater support
020151Y Air heater
020376Y Adaptor handle
020359Y 42x47-mm adaptor
020412Y 15 mm guide
N.B.
TO FIT THE BEARING ON THE COVER, SUPPORT THE COVER WITH THE STUD BOLT SET.
- Refit the driven pulley shaft bearing with a mod-
ular punch as shown in the figure.N.B.
IF THE BEARING HAS AN ASYMMETRICALBALL RETAINER, PLACE IT SO THAT THEBALLS ARE VISIBLE FROM THE HUB INNERSIDE.
Specific tooling020376Y Adaptor handle
020359Y 42x47-mm adaptor
020363Y 20 mm guideN.B.
WHEN FITTING THE BEARINGS ON THE ENGINE CRANKCASE, SUPPORT THE CRANKCASEPREFERABLY ON A SURFACE TO ALLOW THE BEARINGS TO BE DRIVEN VERTICALLY.
- Refit the seeger ring with the opening facing the bearing and fit a new oil guard flush with the crankcase
from the pulley side.
MP3 250 i.e. Engine
ENG - 21
Refitting the hub bearings
- Install the three shafts in the engine crankcase
as shown in the figure.
Refitting the ub cover
- Fit a new gasket together with the centring dow-
els.
- Seal the gasket of the breather pipe using black
silicone sealant.
- Fit the gearbox cover, making sure the breather
pipe is in the correct position.
- Position the shorter screw that can also be rec-
ognised from the different colour as shown in the
figure.
- Fix the breather tube support by means of the
lower screw.
- Fit the remaining screws and tighten the seven
screws to the prescribed torque.
Flywheel cover
Engine MP3 250 i.e.
ENG - 22
Removing the hub cover
- Remove the clip fixing the hose to the cylinder.
- Remove the ten fixings
- Remove the flywheel cover.
Removing the stator
- Remove the two pickup screws and the screw
holding the wiring support and the three stator
clamping screws shown in the figure.
- Remove the stator and its wiring.
MP3 250 i.e. Engine
ENG - 23
Refitting the stator
- Refit the stator and flywheel carrying out the re-
moval procedure in reverse, tightening the retain-
ers to the specified torque.
Locking torques (N*m)Stator assembly screws (°) 3 ÷ 4
Refitting the flywheel cover
- Position the spline clip on the crankshaft and ori-
ent the end as shown in the figure.
- Orient the water pump shaft with reference to the
transmission gear seat as shown in the photo.
- Refit the cover over the engine and tighten the screws to the prescribed torque.
- Carry out the steps in the reverse order from the dismantling procedure.CAUTION
TAKE CARE TO CORRECTLY POSITION THE FLYWHEEL CONNECTOR. MAKE SURE THE CEN-TRING DOWELS ARE PRESENT.
Locking torques (N*m)Flywheel cover screws 11 - 13
Flywheel and starting
Engine MP3 250 i.e.
ENG - 24
Removing the starter motor
- Remove the two screws indicated in the figure.
- Take the starter motor out of its seat
Removing the flywheel magneto
- Remove the water pump shaft and crankshaft
spline clip
- Line up the two holes in the flywheel as shown in
the photo
- Screw in the guide bushing that is part of the
special flywheel stop tool on the flywheel as shown
in the photo.
MP3 250 i.e. Engine
ENG - 25
- Insert the special flywheel stop tool on the fly-
wheel as shown in the photo
Specific tooling020627Y Flywheel lock wrench
- Remove the plate indicated in the photo.
- Remove the flywheel nut with its washer
- Do up the flywheel nut by three or four threads
so that the flywheel does not fall accidentally on
extraction
- Screw the extractor onto the flywheel and extract
it as shown in the photograph
Specific tooling020467Y Flywheel extractor
Inspecting the flywheel components
- Check the integrity of the internal plastic parts of the flywheel and the Pick-Up control plate.
Refitting the free wheel
- Make sure the free wheel contact surfaces are in good condition.
- Thoroughly clean the free wheel to remove LOCTITE residue.
- Degrease the threading of the holes in the free wheel and the clamping screws.
- Apply the recommended product to the end of the screws.
Recommended productsLoctite 243 Medium strength threadlock
Loctite 243 medium-strength threadlock
Engine MP3 250 i.e.
ENG - 26
- Fit the freewheel on the magneto flywheel making
sure that the ground side is in contact with the fly-
wheel itself, i.e. with wheel seeger ring visible.
- Lock the six clamping screws in criss-cross fash-
ion to the prescribed torque.
Locking torques (N*m)Screw fixing freewheel to flywheel 13 ÷ 15
- Oil the free wheel "rollers".
Refitting the flywheel magneto
- Remove the freewheel retaining plate indicated
in the photograph
- Remove the transmission gear and the freewheel
- Insert the free wheel on the flywheel as shown in
the photo
- Then refit the flywheel with free wheel and trans-
mission gear
MP3 250 i.e. Engine
ENG - 27
- Using the special flywheel stop tool, tighten up
the flywheel fixing nut to the prescribed torque
-Refit the retention plate
Specific tooling020627Y Flywheel lock wrench
Locking torques (N*m)Flywheel nut 94 ÷ 102
Refitting the starter motor
- Fit a new O-ring on the starter motor and lubricate
it.
- Fit the starter on the crankcase, locking the two
screws to the prescribed torque.
Locking torques (N*m)Starter motor screws 11 ÷ 13
Cylinder assy. and timing system
Removing the intake manifold
Loosen the three screws and remove the air intake manifold.
- When refitting, secure to the specified torque.
Engine MP3 250 i.e.
ENG - 28
Removing the rocker-arms cover
- Remove the 5 screws indicated in the figure
Removing the timing system drive
- Remove the parts listed below first: transmission
cover, drive pulley with belt, oil sump with spring
and by-pass piston, oil pump pulley cover, O-ring
on the crankshaft and the sprocket wheel separa-
tion washer.
- Remove the tappet cover.
- Remove the central screw fastener and the au-
tomatic valve-lifter retaining cover, as shown in the
figure.
- Remove the return spring of the automatic valve
lifter unit and the automatic valve lifter unit and its
end of stroke washer.
MP3 250 i.e. Engine
ENG - 29
- Loosen the central screw on the tensioner first.
- Remove the two fixings shown in the figure.
- Remove the tensioner with its gasket.
- Remove the internal hex screw and the counter-
weight shown in the figure.
- Remove the camshaft control pulley with its
washer.
- Remove the command sprocket wheel and the
timing chain.
- Remove the screws indicated in the figure, the
spacer bar and the tensioner slider.
The chain tensioning pad must be removed from
the transmission side. As regards the lower chain
guide pad, it may only be removed after the head
has been removed.N.B.
IT IS ADVISABLE TO MARK THE CHAIN IN OR-DER TO ENSURE THAT THE INITIAL DIREC-TION OF ROTATION IS MAINTAINED.
Engine MP3 250 i.e.
ENG - 30
Removing the cam shaft
- Remove the two screws and the cam shaft re-
tainer shown in the diagram.
- Remove the cam shaft.
- Remove the pins and the rocker arms from the
flywheel side holes.N.B.
IN CASE OF NEED, THE HEAD MAY BE RE-MOVED WITH THE CAMSHAFT, PINS, ROCK-ING LEVERS AND FIXING BRACKET. THEHEAD CAN ALSO BE REMOVED WITHOUT RE-MOVING THE CHAIN AND THE DRIVINGSHAFT CHAIN TIGHTENER.
Removing the cylinder head
- Remove the spark plug.
- Remove the 2 side fixings shown in the figure.
- Loosen the 4 head-cylinder fastening nuts in two
or three stages and in criss-cross fashion.
- Remove the head, the two centring dowels and
the gasket.N.B.
IN CASE OF NEED, THE HEAD MAY BE RE-MOVED WITH THE CAMSHAFT, PINS, ROCK-ING LEVERS AND FIXING BRACKET. THEHEAD CAN ALSO BE REMOVED WITHOUT RE-
MP3 250 i.e. Engine
ENG - 31
MOVING THE CHAIN AND THE DRIVINGSHAFT CHAIN TIGHTENER.
Removing the valves
- Using the appropriate tool fitted with an adaptor,
remove the cotters, caps, springs and valves.
- Remove the oil guards with the appropriate tool.
- Remove the lower spring supports.CAUTION
REPLACE THE VALVES IN SUCH A WAY ASTO RECOGNISE THEIR ORIGINAL POSITIONON THE HEAD.
Specific tooling020382Y011 adapter for valve removal tool
020382Y Valve cotters equipped with part 012removal tool
020431Y Valve oil seal extractor
Removing the cylinder - piston assy.
Removing cylinder and piston
- Remove the chain guide pad.
- Remove the 4 O-rings on the stud bolts.
- Pull out the cylinder.
- Remove the cylinder base gasket.
- Remove the two stop rings, the wrist pin and the
piston.
- Remove the piston seals.CAUTION
TO AVOID DAMAGING THE PISTON, SUP-PORT IT WHILE REMOVING THE CYLINDER.N.B.
BE CAREFUL NOT TO DAMAGE THE SEALINGRINGS DURING REMOVAL.
Engine MP3 250 i.e.
ENG - 32
Inspecting the small end
- Measure the internal diameter of the small end
using an internal micrometer.N.B.
REPLACE THE CRANKSHAFT IF THE DIAME-TER OF THE ROD SMALL END EXCEEDS THESTANDARD DIAMETER OR IT SHOWS SIGNSOF WEAR OR OVERHEATING.
CharacteristicChecking the connecting rod small end: Maxi-mum diameter
15.030 mm
Checking the connecting rod small end: Stand-ard diameter
15 +0.015+0.025 mm
Inspecting the wrist pin
- Measure the outer diameter of the gudgeon pin.
- Calculate the coupling clearance between pin
and connecting rod end.
CharacteristicPin diameter: Standard clearance
0.015 ÷ 0.029 mm
Pin diameter Standard diameter
14.996 - 15.000 mm
MP3 250 i.e. Engine
ENG - 33
Inspecting the piston
- Measure the diameter of the wrist pin seat on the
piston.
- Calculate the piston pin coupling clearance.
- Measure the outside diameter of the piston, per-
pendicular to the gudgeon pin axis.
- Take the measurement at 5 mm from the base in
the position shown in the figure.
- Carefully clean the seal housings.
- Measure the coupling clearance between the
seal rings and the grooves using suitable sensors,
as shown in the diagram.
- If the clearance is greater than that indicated in
the table, replace the piston.N.B.
MEASURE THE CLEARANCE BY INSERTINGTHE BLADE OF THE FEELER GAUGE FROMTHE SECOND SEAL SIDE.N.B.
THE PIN HOUSINGS HAVE 2 LUBRICATIONCHANNELS. FOR THIS REASON MEASURE-MENT OF THE DIAMETER MUST BE CARRIEDOUT ACCORDING TO THE AXIS OF THE PIS-TON.
CharacteristicWrist pin seat on the piston: Standard diameter
15.001 ÷ 15.006 mm
Diameter of the wrist pin seat on the piston:Standard clearance
0.001 ÷ 0.010 mm
piston diameter
71.953 - 71.981 mm
Fitting clearanceTop piston ring - standard coupling clearance0.015 - 0.06 mm Top piston ring - maximumclearance allowed after use 0.07 mm Middlepiston ring - standard coupling clearance 0.015- 0.06 mm Middle piston ring - maximum clear-ance allowed after use 0.07 mm oil scraper ring- standard coupling clearance 0.015 - 0.06 mmoil scraper ring - maximum clearance allowedafter use 0.07 mm
Engine MP3 250 i.e.
ENG - 34
Inspecting the cylinder
- Using a bore meter, measure the inner cylinder
diameter at three different points according to the
directions shown in the figure.
- Check that the head coupling surface is not worn
or misshapen.
- Pistons and cylinders are classified according to
diameter. The coupling must be made with those
of the same type (M-M, N-N, O-O, P-P).
Characteristiccylinder: standard diameter
71.990 - 72.018 mm (at 33 mm)
Maximum allowable run-out:
0.05 mm
Inspecting the piston rings
- Alternately insert the three sealing rings into the cylinder, in the area where it retains its original di-
ameter. Using the piston, insert the rings perpendicularly to the cylinder axis.
- Measure the opening (see figure) of the sealing rings using a feeler gauge.
- If any measurements are greater than specified, replace the piston rings.N.B.
BEFORE REPLACING ONLY THE PISTON RINGS, ENSURE THAT THE CLEARANCE BETWEENTHE PISTON RINGS AND THE PISTON RING GROOVES, AND BETWEEN THE PISTON AND THECYLINDER, IS AS SPECIFIED. IN ANY CASE, NEW PISTON RINGS USED IN COMBINATION WITHA USED CYLINDER MAY HAVE DIFFERENT BEDDING CONDITIONS THAN THE STANDARD.
MP3 250 i.e. Engine
ENG - 35
Sealing rings
- Alternately insert the three sealing rings into the
cylinder, in the area where it retains its original di-
ameter. Using the piston, insert the rings perpen-
dicularly to the cylinder axis.
- Measure the opening (see figure) of the sealing
rings using a feeler gauge.
- If any measurements are greater than specified,
replace the piston rings.N.B.
BEFORE REPLACING ONLY THE PISTONRINGS, ENSURE THAT THE CLEARANCE BE-TWEEN THE PISTON RINGS AND THE PISTONRING GROOVES, AND BETWEEN THE PISTONAND THE CYLINDER, IS AS SPECIFIED. IN ANYCASE, NEW PISTON RINGS USED IN COMBI-NATION WITH A USED CYLINDER MAY HAVEDIFFERENT BEDDING CONDITIONS THANTHE STANDARD.
CharacteristicTop piston ring
Standard opening: 0.15 ÷ 0.30 mm
Middle piston ring
Standard opening: 0.20 ÷ 0.40 mm
scraper ring
Standard opening: 0.20 ÷ 0.40 mm
Removing the piston
- Install piston and wrist pin onto the connecting
rod, aligning the piston arrow the arrow facing to-
wards the exhaust.
- Fit the wrist pin stop ring onto the appropriate tool
- With opening in the position indicated on the tool
S = left
D= right
- Place the wrist pin stop ring into position using a
punch
- Fit the wrist pin stop using the plug as shown in
the figureN.B.
Engine MP3 250 i.e.
ENG - 36
THE TOOL FOR INSTALLING THE STOPRINGS MUST BE USED MANUALLY.CAUTION
USING A HAMMER MIGHT DAMAGE THESTOPS' HOUSING.
Specific tooling020454Y Tool for fitting piston pin stops (200 -250)
Choosing the gasket
CharacteristicCompression ratio 250 versionCR: 10.5 ÷ 11.5 : 1
N.B.MEASUREMENT "A" TO BE TAKEN IS A VALUE OF PISTON RE-ENTRY, IT INDICATES BY HOWMUCH THE PLANE FORMED BY THE PISTON CROWN FALLS BELOW THE PLANE FORMED BY
MP3 250 i.e. Engine
ENG - 37
THE TOP OF THE CYLINDER. THE FURTHER THE PISTON FALLS INSIDE THE CYLINDER, THELESS THE BASE GASKET IS TO BE APPLIED (TO RECOVER THE COMPRESSION RATIO) ANDVICE VERSA.
ENGINE 250 SHIMMINGName Measure A Thickness
shimming 3.70 - 3.60 0.4 ± 0.05shimming 3.60 - 3.40 0.6 ± 0.05shimming 3.40 - 3.30 0.8 ± 0.05
Refitting the piston rings
Fitting the sealing rings
- Place the oil scraper spring on the piston.
- Refit the oil scraper ring with the join of spring
ends on the opposite side from the ring gap and
the word 'TOP' towards the crown of the piston.
The chamfered side of the oil scraper ring should
always be facing the piston crown.
- Fit the middle piston ring with the identification
letter facing the crown of the piston. In any case,
the step must be facing opposite the piston top.
- Fit the top piston ring with the word 'TOP' or the
reference mark facing the crown of the piston.
- Offset the piston ring gaps on the three rings by
120° to each other as shown in the figure.
- Lubricate the components with engine oil.
- The top piston ring on the 250 engine has an L
cross section.N.B.
THE TWO PISTON RINGS ARE MADE WITH ATAPERED CYLINDRICAL CONTACT CROSS-SECTION. THIS IS TO ACHIEVE A BETTERBEDDING.
Engine MP3 250 i.e.
ENG - 38
Refitting the cylinder
- Insert the cylinder base gasket with the thickness
determined above.
- Using the fork support and the piston ring retain-
ing band, refit the cylinder as shown in the figure.N.B.
BEFORE FITTING THE CYLINDER, CAREFUL-LY BLOW OUT THE LUBRICATION DUCT ANDOIL THE CYLINDER BARREL.
Specific tooling020426Y Piston fitting fork
020393Y Piston fitting band
Inspecting the cylinder head
- Using a trued bar and feeler gauge check that the
cylinder head surface is not worn or distorted.
Maximum allowable run-out: 0.05 mm
- Check that the camshaft and the rocker pin ca-
pacities exhibit no wear.
- Check that the cylinder head cover surface, the
intake manifold and the exhaust manifold are not
worn.
Characteristicbearing «A»
Ø 12.000 - 12.018 mm
bearing «B»
Ø 20.000 ÷ 20.021 mm
bearing «C»
Ø 37.000 - 37.025 mm
MP3 250 i.e. Engine
ENG - 39
Inspecting the timing system components
- Check that the guide shoe and the tensioner shoe
are not worn out.
- Ensure that the camshaft control pulley chain as-
sembly and the sprocket wheel are not worn.
- If you encounter wear, replace the parts or, if the
chain, sprocket wheel and pulley are worn replace
the whole assembly.
- Remove the centre screw with the washer and
the tensioner spring. Check that the one-way
mechanism is not worn.
- Check the condition of the tensioner spring.
- If examples of wear are found, replace the whole
assembly.
Inspecting the valve sealings
- Insert the valves into the cylinder head.
- Alternatively check the intake and exhaust
valves.
- The test is carried out by filling the manifold with
petrol and checking that the head does not ooze
through the valves when these are just pressed
with the fingers.
Engine MP3 250 i.e.
ENG - 40
Inspecting the valve housings- Check the width of the imprint on the valve
seat«V» wear limit max. 1.6 mm.
- Remove any carbon formation from the valve
guides.
- Measure the inside diameter of each valve guide.
- Take the measurement at three different heights
in the rocker arm push direction.
- If the width of the impression on the valve seat or
the diameter of the valve guide exceed the speci-
fied limits, replace the cylinder head.
CharacteristicValve seat wear Intake guide
limit accepted: 5.022
Valve seat wear Intake guide
Standard diameter: 5.000 ÷ 5.012 mm
Valve seat wear Exhaust guide
Accepted limit 5.022
Valve seat wear Exhaust guide
Standard diameter: 5.000 ÷ 5.012 mm
Inspecting the valves- Measure the width of the sealing surface on the
valve seats and on the valves.
Sealing surface width: After use: Intake and ex-
haust: 1.6 mm
- If any of the sealing surfaces on the valves is
wider than the specified limit or is damaged in one
or more points, or curved, replace the valve with a
new one.CAUTION
DO NOT REVERSE THE FITTING POSITIONSOF THE VALVES (RIGHT - LEFT).
CharacteristicValve wear check Standard: Intake and ex-haust:
0.99 - 1.27 mm
- Measure the diameter of the valve stems in the three positions indicated in the diagram.
MP3 250 i.e. Engine
ENG - 41
- Calculate the clearance between valve and valve guide.
- Check that there are no signs of wear on the surface of contact with the articulated register terminal.
- If the checks above give no failures, you can use the same valves. For best sealing results, it is
advisable to grind the valves. Grind the valves gently with a fine-grained lapping compound. During the
grinding, keep the cylinder head with the valve axes in a horizontal position. This will prevent the lapping
compound residues from penetrating between the valve stem and the guide (see figure).CAUTIONTO AVOID SCORING THE FAYING SURFACE, DO NOT KEEP ROTATING THE VALVE WHEN NOLAPPING COMPOUND IS LEFT. CAREFULLY WASH THE CYLINDER HEAD AND THE VALVESWITH A SUITABLE PRODUCT FOR THE TYPE OF LAPPING COMPOUND BEING USED.N.B.DO NOT CHANGE THE POSITIONS THE VALVES ARE FITTED INCharacteristicValve check standard lengthOutlet: 94.4 mmValve check standard lengthInlet: 94.6 mmValve check Maximum admissible clearanceOutlet: 0.072 mmValve check Maximum admissible clearanceInlet: 0.062 mmValve check standard clearanceOutlet: 0.025 ÷ 0.052 mmValve check standard clearanceInlet: 0.013 ÷ 0.040 mmValve check Minimum admissible diameterOutlet: 4.95 mmValve check Minimum admissible diameterInlet: 4.96 mmValve check Standard diameter:Inlet: 4.972 ÷ 4.987 mmValve check Standard diameter:Outlet: 4.96 ÷ 4.975 mm
Engine MP3 250 i.e.
ENG - 42
Inspecting the springs and half-cones
- Check that the upper spring caps and the cotter
halves show no signs of abnormal wear.
MP3 250 i.e. Engine
ENG - 43
Refitting the valves
- Lubricate the valve guides with engine oil.
- Place the valve spring supports on the head.
- Using the special punch, fit the four valve seals.
- Fit the valves, the springs and the caps. Using
the appropriate tool with adapter, compress the
springs and insert the cotters in their seats.N.B.
DO NOT CHANGE THE VALVE FITTING POSI-TION. FIT THE VALVE SPRINGS WITH THEREFERENCE COLOUR ON COTTER SIDE(TURNS WITH GREATER PITCH).
Specific tooling020306Y Punch for assembling valve sealrings
020382Y Valve cotters equipped with part 012removal tool
020382Y011 adapter for valve removal tool
Inspecting the cam shaft
- Inspect the cam shaft for signs of abnormal wear
on the cams.
- Check the cam height.
- Check there is no wear on the cam shaft retaining
plate and its associated groove on the cam shaft.
- If any of the above dimensions are outside the
specified limits, or there are signs of excessive
wear, replace the defective components with new
ones.
- Check there are no signs of wear on the auto-
matic valve-lifter cam, or the end-of stroke roller,
or the rubber buffer on the automatic valve-lifter
retaining cover.
- Check that the valve lifting spring has not yielded.
- Replace any defective or worn components.
- Check the rocker pins do not show signs of wear
or scoring.
Engine MP3 250 i.e.
ENG - 44
- Measure the internal diameter of each rocker
arm.
Check there are no signs of wear on the pad from
contact with the cam and on the jointed adjustment
plate.
CharacteristicInternal rocker arm diameter: Standard diame-ter
Diameter 12.000 - 12.011 mm
Rocker arm pin diameter: Standard diameter
Diameter 11.977 - 11.985 mm
Cam shaft check: Maximum admissible axialclearance
0.42 mm
Cam shaft check: Standard axial clearance:
0.11 - 0.41 mm
Cam shaft check: Standard height
Outlet: 29.209 mm
Cam shaft check: Standard height
Inlet: 30.285 mm
Cam shaft check: Minimum admissible diame-ter
Bearing B diameter: 19.950 mm
Cam shaft check: Minimum admissible diame-ter
Bearing A Ø: 36.94 mm
Cam shaft check: Standard diameter
Bearing B diameter: 19.959 ÷ 19.98 mm
Cam shaft check: Standard diameter
Bearing A Ø: 36.95 ÷ 36.975 mm
MP3 250 i.e. Engine
ENG - 45
Refitting the head and timing system components
- Fit the timing chain guide pad.
- Insert the centring dowel between the cylinder
head to the cylinder, fit the cylinder head gasket
and the cylinder head.
- Lubricate the stud bolt threading.
- Tighten up the nuts to an initial pre-torque of 7±1
N·m
- Tighten up the nuts to a second pre-torque of 10
±1 N·m
- Rotate by an angle of 270°
- To carry out the operations described above, fol-
low the tightening sequence in the figure.
- Fit the two screws on the outside of the timing
chain side and tighten them to the specified torque.N.B.
BEFORE INSTALLING THE HEAD, MAKESURE THAT THE LUBRICATION CHANNEL ISCLEAN USING A COMPRESSED AIR JET.
Locking torques (N*m)Timing chain tensioner support screw 11 ÷ 13
- Refit the lower timing chain sprocket wheel on the
crankshaft, with the chamfer facing the insertion
side.
- Loop the timing chain around the sprocket on the
crankshaft.
- Fit the chain tensioner slider from the cylinder
head side.
- Fit the spacer and the screw fastener.
- Tighten the screws to the prescribed torque.
- Fit the pins and rocker arms.
- Lubricate the two rocking levers through the
holes at the top.
Engine MP3 250 i.e.
ENG - 46
- Lubricate the 2 bearings and insert the cam shaft
in the cylinder head with the cams corresponding
to the rockers.
- Insert the retention plate and tighten the two
screws shown in the figure to the prescribed tor-
que.
- Refit the spacer on the cam shaft.
- Rotate the engine so that the piston is at top dead
centre, using the reference marks on the flywheel
and the crankcase.
- Holding this position insert the chain on the cam-
shaft control pulley.
- Insert the pulley on the cam shaft while keeping
the reference 4V in correspondence with the ref-
erence mark on the head.
- Fit the counterweight and tighten the fixing screw
to the prescribed torque.
-Fit the end-stop ring on the automatic valve-lifter
cam and fit the automatic valve-lifter cam to the
cam shaft.
- Fit the automatic valve-lifter return spring.
- During this operation the spring must be loaded
by approximately 180°.
- Fit the automatic valve-lifter retaining dish, using
the counterweight screw fastener as a reference.
- Tighten the clamping screw to the prescribed tor-
que.
- Set the tensioner cursor in the rest position.
- Fit the chain tensioner on the cylinder, using a
new gasket, and tight the two screws to the pre-
scribed torque.
- Insert the chain tensioning screw, together with
the spring and washer, tightening it to the prescri-
bed torque.
- Adjust the valve clearance.
- Fit the spark plug.
Electrode distance 0.8 mmN.B.
MP3 250 i.e. Engine
ENG - 47
GREASE THE END STOP RING TO PREVENTIT COMING OUT AND FALLING INTO THE EN-GINE.
Locking torques (N*m)Timing chain tensioner support screw 11 ÷ 13Spark plug 12 ÷ 14 Starter ground screw 7 ÷8.5 Timing chain tensioner slider screw 10 ÷14 Starter ground support screw 11 ÷ 15 Timingchain tensioner central screw 5 - 6 Camshaftretention plate screw 4 ÷ 6
Engine MP3 250 i.e.
ENG - 48
Refitting the rocker-arms cover
- Refit the cylinder head cover, tightening the 5
clamping screws to the prescribed torque.
- Make sure the gasket is positioned properly.
Locking torques (N*m)Tappet cover screws 6 - 7 Nm
Refitting the intake manifold
Fit the intake manifold and do up the three screws.
Locking torques (N*m)Inlet manifold screws 11 ÷ 13
Crankcase - crankshaft
Splitting the crankcase halves
- Before opening the crankcase, it is advisable to
check the axial clearance of the crankshaft. To do
this, use a plate and a support with appropriate tool
dial gauge.
- Upper clearances are an indication of wear on
the surfaces of the crankshaft casing support.
- Remove the 10 crankshaft coupling screws.
- Separate the crankcase while keeping the crank-
shaft in one of the two halves of the crankcase.
- Remove the crankshaft.
- Remove the half crankcase coupling gasket.
MP3 250 i.e. Engine
ENG - 49
- Remove the two screws and the internal cover
shown in the diagram.
- Remove the oil guard on the flywheel side.
- Remove the oil filter fitting shown in the diagram.
- Check the axial clearance on the connecting rod.
- Check the radial clearance on the connecting rod.
-Check the surfaces that limit the axial free-play
are not scored and measure the width of the crank-
shaft between these surfaces, as shown in the
diagram.
- If the axial clearance between crankshaft and
crankcase is exceeding and the crankshaft does
not have any defect, the problem must be due to
either excessive wear or wrong machining on the
crankcase.
- Check the diameters of both the bearings of the
crankshaft in accordance with the axes and surfa-
ces shown in the figure. The half-shafts are clas-
sified in two categories Cat. 1 and Cat. 2 as shown
the chart below.CAUTION
THE CRANKSHAFT CAN BE REUSED WHENTHE WIDTH IS WITHIN THE STANDARD VAL-UES AND THE SURFACES SHOW NO SIGNSOF SCORING.CAUTION
WHILE OPENING THE CRANKCASES AND RE-MOVING THE DRIVING SHAFT, CHECK THATTHE THREADED SHAFT ENDS DO NOT INTER-FERE WITH THE MAIN BUSHINGS. FAILURETO OBSERVE THIS PRECAUTION CAN DAM-AGE THE MAIN BUSHINGS.CAUTION
KEEP THE CRANKSHAFT IN ONE OF THE TWOHALVES OF THE CRANKCASE WHEN SEPA-RATING IT. IF YOU FAIL TO DO THIS, THECRANKSHAFT MIGHT ACCIDENTALLY FALL.N.B.
WHEN MEASURING THE WIDTH OF THECRANKSHAFT, MAKE SURE THAT THE MEAS-UREMENTS ARE NOT MODIFIED BY THE RAD-IUSES OF FITTINGS WITH THE CRANKSHAFTBEARINGS.
Specific tooling
Engine MP3 250 i.e.
ENG - 50
020262Y Crankcase splitting strip
020335Y Magnetic support for dial gauge
CharacteristicAxial crankshaft/crankcase clearance: Stand-ard clearance
0.15 - 0.40 mm (when cold)
Axial connecting rod - crankshaft clearanceStandard clearance
0.20 ÷ 0.50 mm
Radial connecting rod - crankshaft clearanceStandard clearance
0.036 ÷ 0.054 mm
Width of crankshaft with integral washers:standard measurements
55.67 ÷ 55.85 mm
Crankshaft bearings: Standard diameter: Cat.1
28.994 ÷ 29.000
Crankshaft bearings: Standard diameter: Cat.2
29.000 ÷ 29.006
Inspecting the crankshaft alignment
To install the drive shaft on the support and to
measure the misalignment in the 4 points indicated
in figure.
- Check that the driving shaft cone, the tab seat,
the oil seal capacity, the toothed gear and the
threaded tangs are in good working order.
- In case of failures, replace the crankshaft.
The connecting rod head bushings cannot be re-
placed. For the same reason, the connecting rod
may not be replaced and, when cleaning the
MP3 250 i.e. Engine
ENG - 51
crankshaft, be very careful that no impurities get in
through the shaft's lubrication holes.
In order to prevent damaging the connecting rod
bushings, do not attempt cleaning the lubrication
duct with compressed air.
- Make sure that the 2 caps on the crankpin are
properly fitted.
- A wrong installation of a cap can seriously affect
the bushing lubrication pressure.N.B.
THE MAIN BEARINGS ARE NOT GRINDABLE
Specific tooling020074Y Support base for checking crankshaftalignment
CharacteristicOff-line maximum admitted
A = 0.15 mm
B = 0.01 mmC = 0.01 mmD = 0.10 mm
Inspecting the crankcase halves
- Before proceeding to check the crankcase
halves, thoroughly clean the all surfaces and oil
ducts.
- On the transmission-side crankcase half, take
particular care when handling the oil pump com-
partment and the oil ducts, the by-pass duct, the
main bushings and the cooling jet on the trans-
mission side (see diagram).
- Take particular care, also, that there are no signs
wear in the oil by-pass valve housing (see Chapter
Lubrication), as this could prevent a good seal in
the valve, which regulates the oil pressure.
- On the flywheel side crankcase half, take partic-
ular care cleaning the oil ducts for the main bush-
ings, the oil duct for the jet that lubricates the
cylinder head and the oil drainage duct at the fly-
wheel side oil seal.
Engine MP3 250 i.e.
ENG - 52
- Inspect the coupling surfaces on the crankcase
halves for scratches or deformation, taking partic-
ular care with the cylinder/crankcase surfaces and
the crankcase halves surfaces.
- Defects in the crankcase coupling gasket be-
tween the crankcase halves or the mating surfaces
shown in the diagram, could cause a drop in the
oil pressure lubricating the main bearings and con-
nection rod.
- Check the main bearing seats that limit axial
clearance in the crankshaft show no signs of wear.
The dimension between these seats is measured
by way of the procedure described previously for
measuring the crankshaft axial clearance and di-
mensions.N.B.
THE JET IS FED THROUGH THE MAIN BUSH-INGS. PROPER OPERATION OF THIS COMPO-NENT IMPROVES THE PISTON TOP COOLING.CLOGGING HAS EFFECTS THAT ARE DIFFI-CULT TO DETECT (PISTON TEMPERATUREINCREASE). FAILURE OR LEAK CAN CONSID-ERABLY DECREASE THE MAIN BUSHINGAND CONNECTING ROD LUBRICATION PRES-SURE.N.B.
THE HEAD LUBRICATION CHANNEL IS PRO-VIDED WITH A SHUTTER JET; THIS GIVES A"LOW PRESSURE" HEAD LUBRICATION; THISCHOICE WAS MADE TO REDUCE THE OILTEMPERATURE IN THE SUMP. THE JETCLOGGING IMPAIRS THE HEAD LUBRICA-TION AND THE TIMING MECHANISMS. A JETFAILURE CAUSES A DECREASE OF THE MAINBUSHING AND CONNECTING ROD LUBRICA-TION PRESSURE.
MP3 250 i.e. Engine
ENG - 53
Inspecting the crankshaft plain bearings
- T
o obtain a good bushing lubrication it is necessary
to have both an optimal lubricating pressure (3,2
bar) and a good oil flow rate; the bushings must be
correctly positioned so as not to obstruct the oil
supply channels.
- The main bushings are comprised of two half-
bearings, one with holes and channels for lubrica-
tion whereas the other is solid.
- The solid half-bearing is intended to stand the
thrusts caused by combustion, and for this reason
it is arranged opposite the cylinder.
- To prevent obstructions in the oil feeding chan-
nels, the matching surface of the two half-bearings
must be perfectly perpendicular to the cylinder ax-
is, as shown in the figure.
- The oil feeding channel section is also affected
by the bushings driving depth compared with the
crankshaft axial clearance of the limiting surface.
- Check the inside diameter of the main bushings
in the three directions indicated in the diagram.
- Repeat the measurements for the other bushing
half. see diagram.
- There are three crankcase versions: with RED
main bushings, with BLUE main bushings and with
YELLOW main bushings.
- There is only one type of main bushing housing
hole in the crankcase
The standard bushing diameter after driving is var-
iable on the basis of a coupling selection.
- The bushing housings in the crankcase are avail-
able in two categories, Cat. 1 and Cat. 2, as are
the crankshafts.
- The main bushings are available in three thick-
ness categories, identified by colour markings, as
shown in the table below.
Engine MP3 250 i.e.
ENG - 54
TYPE IDENTIFICATION
A RED
B BLUE
C YELLOW
Type "A"
- RED
Type "B"
- BLUE
Type "C"
- YEL-
LOW
Main half-
bearing
1.970 ÷
1.973
1.9703 ÷
1.976
1.976 ÷
1.979
Bush-
ing cat-
egory
Crank-
case
halves
category
Internal bush-
ing diameter
after fitting
Possible
fitting
A 1 29.025 ÷
29.040
Original
B 1 29.019 ÷
29.034
Original
and spare
2 29.028 ÷
29.043
C 2 29.022 ÷
29.037
Original
Match the shaft with two category 1 crank webs
with the category 1 crankcase (or cat. 2 with cat.
2) Furthermore a replacement crankcase cannot
be matched with a crankshaft with mixed catego-
ries. The replacement crankshaft has half-shafts
of the same category.
Crankcase
halves
Engine half-
shaft
Bushing
Cat. 1 Cat. 1 B
Cat. 2 Cat. 2 B
Cat. 1 Cat. 2 A
Cat. 2 Cat. 1 CN.B.
TO KEEP THIS POSITION OF THE BUSHINGSON THE CRANKCASE, FITTING IS FORCED ONSTEEL RINGS INSERTED IN THE CASTING OFBOTH CRANKCASE HALVES.
MP3 250 i.e. Engine
ENG - 55
N.B.
DO NOT TAKE THE MEASUREMENT ON THETWO HALF-SHELL COUPLING SURFACESINCE THE ENDS ARE RELIEVED TO ALLOWBENDING DURING THE DRIVING OPERATION.N.B.
CRANKCASES FOR REPLACEMENTS ARESELECTED WITH CRANKCASE HALVES OFTHE SAME CATEGORY AND ARE FITTEDWITH CATEGORY B BUSHINGS (BLUE)
CharacteristicStandard driving depth
1.35 ÷ 1.6
Diameter of crankcase without bushing
32.953 ÷ 32.963
Refitting the crankcase halves
- Fit the internal bulkhead by locking the two
screws to the prescribed torque.
- Fit the oil filter fitting and tighten it to the specified
torque.
- Position the oil pre-filter element as shown in the
photograph.
- Place a new gasket on one of the crankcase
halves, preferably on the transmission side, to-
gether with the locating dowels.
- Lubricate the main bushings and insert the crank-
shaft in the transmission side crankcase half.
- Reassemble the two crankcase halves.
- Fit the 10 screws and tighten them to the pre-
scribed torque.
- Fit a new O-ring on the pre-filter and lubricate it.
- Insert the filter on the engine with the relative cap.
Tighten to the prescribed torque.
Locking torques (N*m)Internal engine crankcase bulkhead (transmis-sion-side half shaft) screws 4 ÷ 6 Engine-crankcase coupling screws 11 ÷ 13 Oil filter oncrankcase fitting 27 ÷ 33 Engine oil drainageplug/mesh filter 24 ÷ 30
Engine MP3 250 i.e.
ENG - 56
Studs
Check that the stud bolts have not worked loose
from their seat in the crankcase.
Check the depth of stud bolt driving with a gauge,
as indicated in the photograph. If it varies signifi-
cantly from the driving depth indicated, it means
that the stud bolt has yielded.
In this case, replace it.
MP3 250 i.e. Engine
ENG - 57
By working on two fitted cylinder head fixing nuts,
nut and lock nut, as shown in the photograph, re-
move the stud bolt from its seat.
Clean the threaded seat on the carter thoroughly.
Refit a new stud bolt and apply the special product
on the threading crankcase side.
Tighten up to the depth of the driving indicated.
Recommended productsLoctite 'Quick Set' Strong 270 threadlock
Strong 270 threadlock
Lubrication
Conceptual diagrams
LUBRICATION CIRCUIT
Engine MP3 250 i.e.
ENG - 58
MP3 250 i.e. Engine
ENG - 59
Oil pressure check
- Remove the electrical minimum oil pressure
switch connection and remove the switch.
- Check the oil pressure reading is between 0.5
and 1.2 atm with the engine idling at 1650 rpm and
the oil at the required temperature (wait for at least
one electric ventilation).
- Check the oil pressure is between 3.2 and 4.2
atm with the engine running at a speed 6000 rpm
and the oil at the required temperature.
- Remove the appropriate tools once the meas-
urement is complete, refit the oil pressure switch
and washer, tightening it to the specified torque
and fit the fan cover.
- If the oil pressure is outside the specified limits,
in the following order, check: the oil filter, the oil
by-pass valve, the oil pump and the crankshaft
seals.N.B.
THE CHECK MUST BE CARRIED OUT WITHOIL AT THE CORRECT LEVEL AND WITH ANOIL FILTER IN GOOD CONDITION.
CharacteristicOil pressure
Minimum pressure admitted at 6000 rpm: 3.2 atm.
Locking torques (N*m)Minimum oil pressure sensor 12 ÷ 14
Crankshaft oil seals
Engine MP3 250 i.e.
ENG - 60
Removal
- Remove the transmission cover and the com-
plete driving pulley beforehand
- Install the base of the appropriate tool on the oil
guard using the screws provided.
Specific tooling020622Y Transmission-side oil guard punch
- Screw the threaded bar onto the base of the tool
and extract the oil guard.
Specific tooling020622Y Transmission-side oil guard punch
Refitting
- Use a new oil guard for the refitting
- Prepare the new oil guard, lubricating the sealing
lip.
- Preassemble the oil seal with the specific tool,
positioning the screws.
- Insert the sheath over the crankshaft.
- Insert the tool with the oil seal on the crankshaft
until it comes into contact with the crankcase.
- Insert the adaptor bushing of the tool in the hole
on the crankcase.
MP3 250 i.e. Engine
ENG - 61
- Orientate the oil guard by inserting the bracket
which is part of the appropriate tool
- Tighten the threaded bar onto the crankshaft as
far as it will go.
- Use the nut to move the base of the tool until you
can see end of the oil guard driving stroke
- Remove all of the tool components following the
inverse procedureCAUTION
DO NOT LUBRICATE THE SURFACE FOR KEY-ING ONTO THE ENGINE CRANKCASE.CAUTION
ORIENT THE OIL GUARD BY POSITIONINGTHE CHAIN HOUSING CHANNEL FACINGDOWNWARDS. WHEN THE POSITION ISREACHED, DO NOT RETRACT THE OILGUARD. FAILURE TO COMPLY WITH THISRULE CAN CAUSE A WRONG POSITIONINGOF THE OIL GUARD SHEATH.CAUTION
FAILURE TO COMPLY WITH THIS ASSEMBLYPROCEDURE CAN SERIOUSLY DAMAGE THEENGINE DUE TO THE WRONG TENSIONINGOF THE OIL PUMP CONTROL CHAIN.
Specific tooling020622Y Transmission-side oil guard punch
Oil pump
Engine MP3 250 i.e.
ENG - 62
Removal
- Undo the two clamping screws in the figure and
remove the cover over the pump control crown.
- Block the rotation of the oil pump control pulley
with a screwdriver inserted through one of its two
holes.
- Remove the central screw with Belleville washer,
as shown in the diagram.
- Remove the chain with the crown.
- Remove the control sprocket with relative O-ring.
- Remove the oil pump by unscrewing the two
screws in the figure.
- Remove the oil pump seal.N.B.
IT IS ADVISABLE TO MARK THE CHAIN IN OR-DER TO ENSURE THAT THE INITIAL DIREC-TION OF ROTATION IS MAINTAINED.
Inspection
- Remove the two screws and the oil pump cover.
- Remove the clip retaining the innermost rotor.
- Remove and wash the rotors thoroughly with pet-
rol and compressed air.
- Reassemble the rotors in the pump body, keep-
ing the two reference marks visible Replace the
clip.
- Check the clearance between the rotors in the
position shown in the diagram.
MP3 250 i.e. Engine
ENG - 63
Measure the distance between the outer rotor and
the pump body (see figure).
- Check the axial clearance of the rotors using a
trued bar as shown in the figure.
CharacteristicAxial rotor clearance
Limit values admitted: 0.09 mm
Distance between the outer rotor and the pumpbody
Admissible limit clearance: 0.20 mm
Distance between the rotors
Admissible limit clearance: 0.12 mm
Refitting
- Check there are no signs of wear on the oil pump
shaft or body.
- Check there are no signs of scoring or wear on
the oil pump cover.
- If you detect non-conforming measurements or
scoring, replace the faulty parts or the unit.
- Fit the pump cover in the position that permits the
crankcase fixing screws to be aligned.
- Make sure the gasket is positioned properly and
refit the pump on the engine crankcase. The pump
can only be fitted in one position. - Tighten the
screws to the prescribed torque.
Engine MP3 250 i.e.
ENG - 64
- Fit the sprocket wheel with a new O-ring.
- Fit the chain.
- Fit the central screw and the belleville washer.
Tighten to the prescribed torque.
- Fit the oil pump cover by tightening the two
screws to the prescribed torque.N.B.
FIT THE BELLEVILLE WASHER SO THAT ITSOUTER RIM TOUCHES THE PULLEY. MAKESURE THAT THE PUMP TURNS FREELY.
Locking torques (N*m)Screws fixing oil pump to the crankcase 5 - 6Oil pump control crown screw 10 ÷ 14 Oil pumpcover screws 0.7 ÷ 0.9
Removing the oil sump
- Remove the oil filler plug, the transmission cover,
the complete driving pulley assembly with belt and
the sprocket wheel, as described in the "Trans-
mission" chapter.
- Drain the oil as described previously.
- Remove the seven screws, shown in the dia-
gram, and the two rear brake fluid pipe fixing
brackets.
- Remove the screw, the by-pass piston, the gas-
ket and centring dowels shown in the figure.
MP3 250 i.e. Engine
ENG - 65
Inspecting the by-pass valve
- Check the unloaded spring length.
- Check that the small piston is not scored.
- Ensure that it slides freely on the crankcase and
that it guarantees a good seal.
- If not, eliminate any impurities or replace defec-
tive parts.
CharacteristicBy-pass check up: Standard length
54.2 mm
Refitting the oil sump
- Refit the by-pass valve plunger in its housing.
- Insert the pressure-regulating spring.
- Fit a new sump seal.
- Refit the two centring dowels.
- Refit the sump, taking care to locate the spring in
the appropriate recess machined into the inside of
the sump.
- Refit the rear brake cable brackets and the
screws in the reverse order from which they were
removed.
- Tighten the screws to the prescribed torque.
- Refit the driving pulley assembly, the drive belt,
the sprocket wheel and the transmission cover, as
described in the "Transmissions" chapter.
- When testing the lubrication system, refer to
chapter "Crankcase and Crankshaft", regard-
ing lubrication of the crankshaft and connect-
ing rod
Locking torques (N*m)Oil sump screws 10 ÷ 14
Engine MP3 250 i.e.
ENG - 66
INDEX OF TOPICS
INJECTION INJEC
Injection MP3 250 i.e.
INJEC - 2
TRANSPARENCYSpecification Desc./Quantity
1 Fuel injector2 Throttle body and electronic injection control
unit (MIU)3 Diagnostics socket connector4 Battery 12V - 12 Ah5 Engine rpm sensor6 HV coil7 Lambda sensor8 Fuel pump9 Water temperature sensor10 Injection load remote control11 Instrument panel
MIU injection system
This vehicle is fitted with an integrated injection and ignition system.
Injection is indirect in the manifold through an electro-injector.
The injection and ignition are timed on the four-stroke cycle by means of a tone wheel keyed on to the
crankshaft (24-2 teeth) and pick-up sensor.
Combustion and ignition are managed on the basis of engine revs and throttle valve opening. Further
corrections are made according to the following parameters:
- Coolant temperature.
- Intake air temperature
- Lambda probe strength
The system implements an idle feeding correction with cold engine through a Stepper motor on a by-
pass circuit of the throttle valve. The control unit manages the Stepper motor and the injector opening
time, thereby ensuring the idle steadiness and the proper combustion.
In all conditions of use, mixture preparation is managed by modifying the injector opening time.
The fuel supply pressure is kept constant based on the ambient pressure.
The feed circuit consists of:
- Fuel pump
- Fuel filter
- Injector
- Pressure regulator
Pump, filter and regulator are placed into the fuel tank using a single support.
The injector is connected by two pipes provided with quick couplings. This allows obtaining a continuous
circulation, thereby avoiding the risk of fuel boiling. The pressure regulator is situated at the end of the
circuit.
The fuel pump is controlled by the MIU; this ensures the scooter's safety
The ignition circuit consists of:
MP3 250 i.e. Injection
INJEC - 3
- HV coil
- HV cable
- Shielded cap
- MIU control unit
- Spark plug
The MIU control unit manages ignition with the best advance ensuring four-stroke timing (ignition only
in the compression phase) at the same time.
The MIU injection-ignition system controls engine functions by means of a pre-set program.
Should any input signals fail, an acceptable working order of the engine is ensured to allow the user to
reach a service station.
Of course, this cannot happen when the rev counter signal is missing, or when the failure involves the
control circuits:
- Fuel pump
- HV coil
- Injector
The control unit is provided with a self-diagnosis
system connected to an indicator light in the in-
strument panel.
Failures are detected and restored by the diag-
nostic tester.
In any case, when the fault is no longer present,
the data storage is automatically cleared after 16
cycles of use (cold start, running at regular engine
temperature, stop).
The diagnostic tester is also required to adjust the
idle mixture.
Specific tooling020460Y Scooter diagnosis and tester
Injection MP3 250 i.e.
INJEC - 4
The MIU injection-ignition system carries out
checks on the rpm counter and the electric fan for
radiator cooling.
The MIU control unit has a decoder for the anti-
theft immobiliser.
The MIU control unit is connected to a diagnostic
LED on the instrument panel, that also carries out
the deterrent flashing functions.
The MIU control unit power supply is furthermore controlled by the emergency switch; that is to provide
further safety for the scooter.
PrecautionsTroubleshooting hints
1 A fault in the MIU system could most likely be due to the connections and not the components.
Before troubleshooting the MIU system, carry out the following checks:
A: Electrical power supply
a. Battery voltage
b. Blown fuse
c. Remote controls
d. Connectors
B: Chassis earthing
C: Fuel supply
a. Broken fuel pump
b. Dirty fuel filter
D: Ignition system
a. Faulty spark plug
b. Broken coil
c. Broken shielded cap
E: Intake circuit
a. Dirty air filter
b. Dirty by-pass circuit
c. Faulty Stepper motor
F: Other
a. Incorrect distribution timing
b. Wrong idle mixture
c.Incorrect reset of the throttle valve position sensor
2 MIU system faults may be caused by loose connectors. Make sure that all connections have been
correctly made.
MP3 250 i.e. Injection
INJEC - 5
Check the connections as follows:
A check that the terminals are not bent.
B check that the connectors have been properly connected.
C see whether the malfunction can be fixed by shaking the connector slightly.
3 Check the entire system before replacing the MIUIf the fault is fixed by replacing the MIU control unit,
install the original control unit again and check if the fault occurs again.
4 When troubleshooting use a multimeter with an internal resistance over 10 Ohm /V. Instruments that
are not suitable might damage the MIU control unit. Instruments must be used with definitions over 0.1V
and 0.5 W , the precision must be greater than 2%.
1. Before fixing any part of the injection system, check to see if there are any registered faults. Do not
disconnect the battery before checking for faults.
2. The fuel feed system is pressurised at 250 kPa (2.5 BAR). Before disconnecting the quick coupler
of a pipe in the fuel supply system, check that there are no naked flames, and do not smoke. Act with
caution to prevent spraying in the eyes.
3. When fixing electric components, operate with battery connected only when actually required.
4. When functional checks are performed, check that the battery voltage is more than 12V.
5. Before trying to start up, check to make sure there is at least two litres of fuel in the tank. Failure to
respect this norm will damage the fuel pump.
6. If the scooter is expected to remain unused for a long time, refill the tank up to a little over half the
level. This will ensure the pump will be covered by fuel.
7. When washing the vehicle, be careful with the electric components and wiring.
8. When an ignition fault is detected, start the checks from the battery and the injection system con-
nections.
9. Before disconnecting the MIU control unit connector, perform the following steps in the order shown:
- Set the switch to «OFF»
- Disconnect the battery
Failure to respect this norm may damage the control unit.
10. Do not invert the polarity when fitting the battery.
11. To avoid damage, only disconnect and reconnect the MIU system connectors if required. Before
reconnecting, check that the connectors are dry.
12. When carrying out electric inspections, do not force the tester probes into the connectors. Do not
take measurements not specifically foreseen by the manual.
13. At the end of every check performed with the diagnostic tester, protect the system connector with
its cap. Failure to do this may damage the MIU control unit.
14. Before reconnecting the quick couplers of the power supply system, check that the terminals are
perfectly clean.
Injection MP3 250 i.e.
INJEC - 6
EMS circuit diagram
1. Battery 12V - 12 Ah
2. Engine rpm sensor
3. coolant temperature sensor:
4. Immobilizer aerial
5. Stop switches
6. Fuse No. 2 20A
7. Fuse No. 6 3A
8. Key switch contacts
9. Fuse No. 5 15A
10.Engine stop switch
MP3 250 i.e. Injection
INJEC - 7
11.Fuse No. 10 7.5A
12.CAN line connection with tilt locking electric control unit
13.Fuse No. 8 10A
14.Starter button
15.Injection load remote control
16.Starter remote control
17.Electric fan starter
18.Starter motor
19.Electric fan motor
20.Fuel pump
21.H.V. coil
22.Fuel injector
23.Lambda sensor
24.Engine "WARNING" light
25.Immobilizer LED
26.Diagnostics connector
Troubleshooting procedure
Engine does not start
ENGINE DOES NOT START IF ONLY PULLEDPossible Cause Operation
Immobiliser enabling signal System not encodedSystem not efficient, repair according to the indi-
cations of the self-diagnosisPresence of faults detected by the self diagnosis Pump relay
HV coilInjector
revolution timing sensorFuel supply Fuel in the tank
Fuel pump activationFuel pressure (low)
Injector capacity (low)Power to the spark plug Shielded spark-plug cap HV coil (secondary insu-
lation)Parameter reliability Coolant temperature
Distribution timing - injection ignitionIntake air temperature
End of compression pressure End of compression pressure
Injection MP3 250 i.e.
INJEC - 8
Starting difficulties
ENGINE START-UP PROBLEMSPossible Cause Operation
Presence of faults detected by the self diagnosis Pump relayHV coilInjector
revolution timing sensorAir temperature
Coolant temperatureStart-up speed Starter motor and remote control
BatteryGround connections
End of compression pressure End of compression pressurePower to the spark plug Spark plug
Shielded capHV coil
Revolution timing sensorIgnition advance
Fuel supply Fuel pressure (low)Injector capacity (low)Injector sealing (poor)
Correctness of the parameters Coolant temperatureStepper throttle valve position intake air tempera-
ture (steps and actual opening)Cleaning of the auxiliary air pipe and throttle valve;
air filter efficiency
Engine stops at idle
ENGINE DOES NOT HOLD IDLING/ IDLING IS UNSTABLE/ IDLING TOO LOWPossible Cause Operation
Presence of faults detected by the self diagnosis Pump relayHV coilInjector
revolution timing sensorAir temperature
Coolant temperatureIgnition efficiency Spark plug
Ignition timingCorrectness of the parameters Throttle valve position sensor
StepperCoolant temperature sensor
Intake air temperature sensorIntake system cleaning Air filter
Diffuser and throttle valveAdditional air pipe and Stepper
Intake system sealing (infiltrations) Intake manifold - headThrottle body - manifold
Intake sleeveFilter box
Fuel feed (low pressure) Fuel pumpPressure regulator
MP3 250 i.e. Injection
INJEC - 9
Possible Cause OperationFuel filter
Injector capacity
Engine does not rev down
ENGINE DOES NOT RETURN TO THE IDLING SPEED/IDLING SPEED TOO HIGHPossible Cause Operation
Presence of faults detected by the self diagnosis Pump relayHV coilInjector
revolution timing sensorAir temperature
Coolant temperatureIgnition efficiency Ignition timing
Correctness of the parameters Throttle valve position sensorStepper
Coolant temperature sensorIntake air temperature sensor
Intake system sealing (infiltrations) Intake manifold - headThrottle body - manifold
Intake sleeveFilter box
Fuel feed (low pressure) Fuel pumpPressure regulator
Fuel filterInjector capacity
Exhaust backfires in deceleration
EXHAUST BACKFIRES WHEN DECELERATINGPossible Cause Operation
Presence of faults detected by the self diagnosis Pump relayHV coilInjector
revolution timing sensorAir temperature
Coolant temperatureLambda sensor
Correctness of the parameters Throttle valve position sensorStepper
Coolant temperature sensorIntake air temperature sensor
Intake system sealing (infiltrations) Intake manifold - headThrottle body - manifold
Intake sleeveFilter box
Fuel feed (low pressure) Fuel pumpPressure regulator
Fuel filterInjector capacity
Exhaust system sealing (infiltrations) Manifold - headManifold - muffler
Injection MP3 250 i.e.
INJEC - 10
Possible Cause OperationMuffler welding
Engine revs irregularly
ENGINE IRREGULAR PROGRESS WITH VALVE SLIGHTLY OPENPossible Cause Operation
Intake system cleaning Air filterDiffuser and throttle valve
Additional air pipe and StepperIntake system seal Intake sleeve
Filter boxIgnition system Spark plug wear check
Parameter reliability Throttle valve position signalCoolant temperature indicator
Intake air temperature indicatorIgnition advance
TPS reset successful TPS reset successfulPresence of faults detected by the self diagnosis Pump relay
HV coilInjector
revolution timing sensorAir temperature
Coolant temperatureLambda sensor
Poor performance at full throttle
POOR ENGINE PERFORMANCE AT FULL POWER/ ENGINE IRREGULAR PROGRESSON PICKUP
Possible Cause OperationPresence of faults detected by the self diagnosis Pump relay
HV coilInjector
revolution timing sensorAir temperature
Coolant temperatureLambda sensor
Spark plug power supply Spark plugShielded cap
HV cableHV coil
Intake system Air filterFilter box (sealing)
Intake sleeve (sealing)Parameter reliability Throttle valve position signal
Coolant temperature indicatorIntake air temperature indicator
Ignition advanceFuel supply Fuel level in the tank
Fuel pressureFuel filter
Injector capacity
MP3 250 i.e. Injection
INJEC - 11
Engine knocking
PRESENCE OF KNOCKING (HEAD KNOCKING)Possible Cause Operation
Presence of faults detected by the self diagnosis Pump relayHV coilInjector
revolution timing sensorAir temperature
Coolant temperatureLambda sensor
Ignition efficiency Spark plugParameter reliability Throttle valve position signal
Coolant temperature indicatorIntake air temperature indicator
Ignition advanceIntake system seal Intake sleeve
Filter boxTPS reset successful TPS reset successful
Fuel supply Fuel pressureFuel filter
Injector capacityFuel quality
Selection of the cylinder base gasket thickness Selection of the cylinder base gasket thickness
Fuel supply system
The fuel supply circuit includes the electric pump, the filter, the pressure regulator. the electro-injector
and the delivery and return pipes.
The electrical pump is located in the tank from which the fuel is pumped and sent to the injector through
the filter.
The pressure is controlled by the pressure regulator situated in the pump assembly in the tank.
Injection MP3 250 i.e.
INJEC - 12
Removing the butterfly valve
Remove the fuel piping clamping screw indicated
in the figure.
Remove the snap-on fittings from the injector sup-
port
MP3 250 i.e. Injection
INJEC - 13
Remove the injector connector
Remove the three screws fixing the manifold to the
cylinder head and the clip fixing the throttle body
to the manifold.
Remove the MIU connector
Remove the clip fixing the throttle body to the pu-
rifier bellows
Injection MP3 250 i.e.
INJEC - 14
Remove the gas command fitting as indicated in
the photograph
Refitting the butterfly valve
To refit, perform the operations in the reverse or-
der from the removal operations being careful to
position the clip fixing the throttle body to the air
filter bellows at 45° as shown in the photograph.
MP3 250 i.e. Injection
INJEC - 15
Pump supply circuit
INJECTION LOADSSpecification Desc./Quantity
1 Battery 12V - 12 Ah2 Fuse 15A3 Fuse 20A4 Key switch contacts5 Fuse 7.5 A6 Injection load remote control7 Fuel pump8 HV coil
Injection MP3 250 i.e.
INJEC - 16
Specification Desc./Quantity9 Fuel injector10 Lambda sensor11 Electric fan starter
When switched to "ON", the fuel pump starts to rotate for two seconds and then stops. When the engine
starts up, in the presence of rpm timing signal the pump is continuously supplied.
ELECTRICAL DATA
• Pump winding resistance ~ 1.5 Ohm
• Input current during normal functioning 1.4 ÷ 1.8 A
• Input current to the closed hydraulic circuit ~ 2 A (to be checked with specific tool for fuel
pressure control, choking the circuit on the return pipe)
Check the efficiency of injection load 15 A fuse No.
5.
Check the efficiency of live control unit power sup-
ply 7.5A fuse No. 10 .
Check the efficiency of the injection load remote
control: Check the resistance of the energising coil
between pins 86 and 85: 40 to 80 Ohm
Apply a voltage of 12V to pins 86 and 85; make
sure that there is continuity between pins 30 and
87 of the remote control.
MP3 250 i.e. Injection
INJEC - 17
Check the power supply line of the injection load
remote control energising coil: after switching to
"ON", make sure there is battery voltage, for two
seconds, between the Red-White cable and Black-
Violet cable of the remote control base. If there is
not, check the continuity of the Red-White cable
between the fuse box and the remote control base
and of the Black-Purple cable between the pin 20
of the control unit and the remote control base.N.B.
CONTINUITY TESTS MUST BE CARRIED OUTWITH THE COMPONENTS DISCONNECTED.(REMOTE CONTROLS, CONTROL UNIT,FUSES ETC.).
Injection MP3 250 i.e.
INJEC - 18
Check the presence of fixed voltage between the
grey/black cable of the remote control base and
earth. If there is none check the continuity of the
grey/black cable between the fuse box (No. 5 15
A) and the remote control base.N.B.
CONTINUITY TESTS MUST BE CARRIED OUTWITH THE COMPONENTS DISCONNECTED.(REMOTE CONTROLS, CONTROL UNIT,FUSES ETC.).
MP3 250 i.e. Injection
INJEC - 19
pump circuit 6
Check, on switching to "ON", that there is battery
voltage, for about two seconds, to the Black-Green
cable of the pump connector and earth with pump
connector disconnected. Otherwise check the
continuity of the Black-Grey cable between the
pump connector and the base of the remote con-
trol.
Check the efficiency of the earth line of the fuel
pump by measuring the continuity between the
pump connector black cable, system side, and the
earth.
If, when switching to "ON", the pump continues to
turn after two seconds of activation, check, with the
control unit disconnected and the injection load re-
mote control disconnected, that the Black-Purple
cable (pin 20 on the interface wiring) is insulated
from the earth.
Specific tooling020331Y Digital multimeter
Injection MP3 250 i.e.
INJEC - 20
Circuit leak test
Install the appropriate tool for fuel pressure control
with the pipe fitted with the pressure gauge on the
delivery pipe..
Check during regular operation by placing the ap-
propriate tool between the pump and the injector.
With the battery voltage> 12 V check that the fuel
pressure is 2.5 BAR and that the input current is
1.4 to 1.8 A
With the battery voltage > 12 V, check the pump flow rate by disconnecting from the injector the pipe
equipped with the pressure gauge of the appropriate tool. Make a graded burette available with a flow
rate of approximately 1 L. Rotate the pump using the active diagnosis of the palm top computer. Using
a pair of long flat needle-nose pliers, choke the fuel pipe making the pressure stabilise at approx. 2.5
BAR. Check that, in fifteen seconds, the pump has a flow rate of around 110 cm³.
Specific tooling020480Y Petrol pressure check set
Fuel filter check
Disconnect the terminals from the electric pump
MP3 250 i.e. Injection
INJEC - 21
Remove the screw shown in the photograph
Remove the clip fixing the piping to the filter shown
in the photograph
Separate the lower part of the pump support as
shown in the photograph.
Remove the filter from the pump support
Injection MP3 250 i.e.
INJEC - 22
Inspecting the injector circuit
INJECTION LOADSSpecification Desc./Quantity
1 Battery 12V - 12 Ah2 Fuse 15A3 Fuse 20A4 Key switch contacts5 Fuse 7.5 A6 Injection load remote control7 Fuel pump8 HV coil
MP3 250 i.e. Injection
INJEC - 23
Specification Desc./Quantity9 Fuel injector10 Lambda sensor11 Electric fan starter
Check the resistance at the injector ends: 14.5 ± 5% Ohm
Check the efficiency of injection load 15 A fuse No.
5.
Check the efficiency of live control unit power sup-
ply 7.5A fuse No. 10 .
Check the efficiency of the injection load remote
control: Check the resistance of the energising coil
between pins 86 and 85: 40 to 80 Ohm
Apply a voltage of 12V to pins 86 and 85; make
sure that there is continuity between pins 30 and
87 of the remote control.
Injection MP3 250 i.e.
INJEC - 24
Check the power supply line of the injection load
remote control energising coil: after switching to
"ON", make sure there is battery voltage, for two
seconds, between the Red-White cable and Black-
Violet cable of the remote control base. If there is
not, check the continuity of the Red-White cable
between the fuse box and the remote control base
and of the Black-Purple cable between the pin 20
of the control unit and the remote control base.N.B.
CONTINUITY TESTS MUST BE CARRIED OUTWITH THE COMPONENTS DISCONNECTED.(REMOTE CONTROLS, CONTROL UNIT,FUSES ETC.).
Check the presence of fixed voltage between the
grey/black cable of the remote control base and
earth. If there is none check the continuity of the
grey/black cable between the fuse box (No. 5 15
A) and the remote control base.N.B.
CONTINUITY TESTS MUST BE CARRIED OUTWITH THE COMPONENTS DISCONNECTED.(REMOTE CONTROLS, CONTROL UNIT,FUSES ETC.).
MP3 250 i.e. Injection
INJEC - 25
Check the presence of fixed voltage between the
grey/black cable of the remote control base and
earth. If there is none check the continuity of the
grey/black cable between the fuse box (No. 4 10
A) and the remote control base.N.B.
CONTINUITY TESTS MUST BE CARRIED OUTWITH THE COMPONENTS DISCONNECTED.(REMOTE CONTROLS, CONTROL UNIT,FUSES ETC.).
Injection MP3 250 i.e.
INJEC - 26
With the control unit and the injector disconnected,
check the continuity of the Red-Yellow cable be-
tween pin 14 of the interface wiring and the injector
connector
Switch to "ON" and check if there is voltage, with
injector disconnected and control unit connected,
between the Black-Green cable of the injector con-
nector and the ground lead
With injector disconnected and the injector load
remote control disconnected, check the continuity
of the Black-Green cable between the injector con-
nector and remote control base.
MP3 250 i.e. Injection
INJEC - 27
Inspecting the injector hydraulics
To carry out the injector check, remove the intake
manifold by removing the three clamping screws
at the head and the clip connecting the control unit
to the manifold.
Install the appropriate tool for checking fuel pres-
sure and position the manifold over a container
graduated by at least 100 cm³. Connect the injec-
tor with the cable making up part of the supply for
the injection tester. Connect the clamps of the ca-
ble to an auxiliary battery. Activate the fuel pump
with the active diagnosis. Check that, in fifteen
seconds, approximately 40 cc of fuel is dispensed
with a regulation pressure of approximately 2.5
BAR.
Specific tooling020480Y Petrol pressure check set
Proceed with the injector seal test.
Dry the injector outlet with a blast of compressed
air. Activate the fuel pump. Wait for one minute,
making sure there are no leaks coming from the
injector. Slight oozing is normal.
Value limit = 1 drop per minute
Injection MP3 250 i.e.
INJEC - 28
Components location
MP3 250 i.e. Injection
INJEC - 29
TRANSPARENCYSpecification Desc./Quantity
1 Fuel injector2 Throttle body and electronic injection control
unit (MIU)3 Diagnostics socket connector4 Battery 12V - 12 Ah5 Engine rpm sensor6 HV coil7 Lambda sensor8 Fuel pump9 Water temperature sensor10 Injection load remote control11 Instrument panel
Tachometer
With wiring disconnected from the control unit and
connected to the system, check that the sensor
resistance between pins 13 - 15 is between 100
and 150 Ohm at an engine temperature of approx-
imately 20°
Injection MP3 250 i.e.
INJEC - 30
Disconnect the fuel pipe connector. Start up the
engine and wait for it to stop. With the wiring con-
nected to the control unit and system try to start up
the engine and check that the voltage between
pins 13 and 15 is around 2.8 V
With the interface cable harness disconnected
from the control unit, check continuity between pin
13 and the red cable of the rpm sensor connector
and between pin 15 and the brown cable of the rpm
sensor connector
With the interface wiring disconnected from the
control unit and rpm sensor connector, check that
the red and brown cables (pin 13 - 15) are isolated
from each other and insulated from the earth.
Specific tooling020481Y Control unit interface wiring
020331Y Digital multimeter
MP3 250 i.e. Injection
INJEC - 31
HT coil
INJECTION LOADSSpecification Desc./Quantity
1 Battery 12V - 12 Ah2 Fuse 15A3 Fuse 20A4 Key switch contacts5 Fuse 7.5 A6 Injection load remote control7 Fuel pump8 HV coil
Injection MP3 250 i.e.
INJEC - 32
Specification Desc./Quantity9 Fuel injector10 Lambda sensor11 Electric fan starter
The ignition system is integrated with the injection and is of the inductive high efficiency type.
The control unit manages two important parameters:
- Ignition advance
This is optimised according to the engine rpm, to the engine load, temperature and ambient pressure
With idle engine, it is optimised to obtain the stabilisation of the speed at 1450 ± 50 R/1'.
- Magnetisation time
The coil magnetisation time is controlled by the control unit. The ignition power is increased during the
engine start-up.
The injection system recognises the 4-stroke cycle and therefore, ignition is only controlled during
compression.
Specific tooling020331Y Digital multimeter
Check the efficiency of injection load 15 A fuse No.
5.
Check the efficiency of live control unit power sup-
ply 7.5A fuse No. 10 .
Check there is voltage between pins 22 and 26 of
the interface wiring for around two seconds when
switching to «ON».
MP3 250 i.e. Injection
INJEC - 33
Check the resistance of the primary coil between
pin 22 of the interface wiring and the green black
cable of the injection load remote control base with
the control unit disconnected and the remote con-
trol disconnected.
Resistance of the primary = 0.5 ± 8% Ohm
Check the efficiency of the injection load remote
control: Check the resistance of the energising coil
between pins 86 and 85: 40 to 80 Ohm
Apply a voltage of 12V to pins 86 and 85; make
sure that there is continuity between pins 30 and
87 of the remote control.
Injection MP3 250 i.e.
INJEC - 34
Check the power supply line of the injection load
remote control energising coil: after switching to
"ON", make sure there is battery voltage, for two
seconds, between the Red-White cable and Black-
Violet cable of the remote control base. If there is
not, check the continuity of the Red-White cable
between the fuse box and the remote control base
and of the Black-Purple cable between the pin 20
of the control unit and the remote control base.N.B.
CONTINUITY TESTS MUST BE CARRIED OUTWITH THE COMPONENTS DISCONNECTED.(REMOTE CONTROLS, CONTROL UNIT,FUSES ETC.).
MP3 250 i.e. Injection
INJEC - 35
Check the presence of fixed voltage between the
grey/black cable of the remote control base and
earth. If there is none check the continuity of the
grey/black cable between the fuse box (No. 5 15
A) and the remote control base.N.B.
CONTINUITY TESTS MUST BE CARRIED OUTWITH THE COMPONENTS DISCONNECTED.(REMOTE CONTROLS, CONTROL UNIT,FUSES ETC.).
Injection MP3 250 i.e.
INJEC - 36
Coolant temperature sensor
TEMPERATURE SENSOR 1Specification Desc./Quantity
1 Water temperature sensor2 Engine stop switch
With the connector on the control unit side discon-
nected and the coolant temperature sensor con-
nector connected, check the resistance values
between pins 9 and 18 correspond to the engine
temperature.
20° = 2500 ± 100 Ω
80° = 308 ± 6 Ω
With the control unit side connector disconnected
and the coolant temperature connector discon-
MP3 250 i.e. Injection
INJEC - 37
nected, check the insulation between the two light
blue-green and grey-green cables
With the connector on the control unit side discon-
nected and the coolant temperature sensor con-
nector disconnected, check the continuity be-
tween pin 9 of the interface wiring and the blue-
green cable of the connector, and between pin 18
of the interface wiring and the grey-green cable of
the connector.
Specific tooling020481Y Control unit interface wiring
020331Y Digital multimeter
Zeroing the throttle
Resetting the throttle valve position signal (TPS reset)
The MIU control unit is supplied with a throttle valve position sensor that is pre-calibrated.
Pre-calibration entails regulating the minimum opening of the throttle valve to obtain a certain flow of
air under pre-set reference conditions.
Pre-calibration ensures optimal air flow to control idling.
This regulation must not be tampered with in any way whatsoever.
The injection system will complete the management of the idling through the Stepper motor and the
variation of the ignition advance.
The throttle body after the pre-calibration has an opened valve with an angle that can vary depending
on the tolerances of the machining of the pipe and the valve itself.
The valve position sensor can also assume various fitting positions. For these reasons the mV of the
sensor with the valve at idle can vary from one throttle body to another.
To obtain the optimum fuel mixture, especially at small openings of the throttle valve, it is essential to
match the throttle body with the control unit following the procedure known as TPS resetting.
With this operation we inform the control unit, as the starting point, of the mV value corresponding to
the pre-calibrated position.
To reset, proceed as follows.
Injection MP3 250 i.e.
INJEC - 38
Connect the diagnostic tester.
Switch to «ON».
Select the functions of the diagnostic tester on
«TPS RESET».
Specific tooling020460Y Scooter diagnosis and tester
Make sure that the throttle valve with the control is
supporting the stop screw.
Guaranteeing that this position will be kept, send
a confirmation for the TPS reset procedure.
MP3 250 i.e. Injection
INJEC - 39
Reset should be performed in the following cases:
- on first fitting.
- if the injection control unit is replaced.N.B.
THE TPS RESETTING PROCEDURE MUST NOT BE CARRIED OUT WITH A USED THROTTLEBODY BECAUSE POSSIBLE VALVE WEAR AND STOP WEAR FOR THE MINIMUM OPENINGMAKE THE AIR FLOW DIFFERENTLY FROM THAT OF PRE-CALIBRATION.
Given that the TPS resetting is also done when the
control unit is replaced, place the control unit - filter
box bellows at 45° during the refitting operation as
shown in the photograph.
Lambda probeSIGNAL CONTROL
Install the electronic control unit interface wiring.
Start the engine and warm up until the electric fan
switches on.
Use an analogue multimeter with a direct voltage
scale measuring down to 2 V.
Place the tips of the multimeter between pins 4 (-)
and 11 (+)
Injection MP3 250 i.e.
INJEC - 40
With the engine running at idle speed, check that
the voltage oscillates between 0V and 1V
With the throttle valve completely open, the volt-
age is approx. 1V.
During the closing phase, the voltage is approx.
0V.
If the voltage remains constant, the sensor may be
damaged. Remove the sensor and check that
there are no oil or carbon deposits inside it..
MP3 250 i.e. Injection
INJEC - 41
INJECTION LOADSSpecification Desc./Quantity
1 Battery 12V - 12 Ah2 Fuse 15A3 Fuse 20A4 Key switch contacts5 Fuse 7.5 A6 Injection load remote control7 Fuel pump8 HV coil9 Fuel injector10 Lambda sensor
Injection MP3 250 i.e.
INJEC - 42
Specification Desc./Quantity11 Electric fan starter
The Lambda sensor or oxygen sensor is a sensor which provides indications concerning the oxygen
content in the exhaust gas. The signal generated is not of the proportional type but of the ON/OFF type,
i.e. there is oxygen or there is not. The sensor is positioned on the exhaust manifold before the catalytic
converter in an area where the gas temperature is always high. The temperature at which the sensor
works is at least 350°C at 600°C and it has a reaction time of just 50 milliseconds. The signal generated
passes from a high value to a low value with a mixture with lambda =1. Since the sensor only works at
high temperatures, it has an electric preheating element inside it, controlled by the control unit, to take
it quickly to the functioning state.
Specific tooling020481Y Control unit interface wiring
020331Y Digital multimeter
Check the efficiency of injection load 15 A fuse No.
5.
Check the efficiency of live control unit power sup-
ply 7.5A fuse No. 10 .
Check there is voltage between pins 21 and 26 of
the interface wiring, for around two seconds, when
switching to «ON».
MP3 250 i.e. Injection
INJEC - 43
With the engine cold, check the resistance of the
Lambda sensor heater between pin 21 of the in-
terface wiring and the black green cable of the
injection load remote control base, with the control
unit disconnected and the remote control discon-
nected.
Resistance of the heater at approximately 20° = 9
Ohm ± 20%
Check the efficiency of the injection load remote
control: Check the resistance of the energising coil
between pins 86 and 85: 40 to 80 Ohm
Apply a voltage of 12V to pins 86 and 85; make
sure that there is continuity between pins 30 and
87 of the remote control.
Check the power supply line of the injection load
remote control energising coil: after switching to
"ON", make sure there is battery voltage, for two
seconds, between the Red-White cable and Black-
Violet cable of the remote control base. If there is
not, check the continuity of the Red-White cable
between the fuse box and the remote control base
and of the Black-Purple cable between the pin 20
of the control unit and the remote control base.N.B.
CONTINUITY TESTS MUST BE CARRIED OUTWITH THE COMPONENTS DISCONNECTED.(REMOTE CONTROLS, CONTROL UNIT,FUSES ETC.).
Injection MP3 250 i.e.
INJEC - 44
MP3 250 i.e. Injection
INJEC - 45
Check the presence of fixed voltage between the
grey/black cable of the remote control base and
earth. If there is none check the continuity of the
grey/black cable between the fuse box (No. 4 10
A) and the remote control base.N.B.
CONTINUITY TESTS MUST BE CARRIED OUTWITH THE COMPONENTS DISCONNECTED.(REMOTE CONTROLS, CONTROL UNIT,FUSES ETC.).
Injection MP3 250 i.e.
INJEC - 46
INDEX OF TOPICS
SUSPENSIONS SUSP
This section is devoted to operations that can be carried out on the suspension.
Front
Removing the front wheel
- Remove the 5 fixing screws indicated in the pho-
tograph.
Locking torques (N*m)Wheel fixing screw 20 ÷ 25
Front wheel hub overhaul
- Remove the ball bearing seeger ring indicated in
the photograph
Extract the ball bearing using the specific tool
Specific tooling001467Y014 Pliers to extract ø 15-mm bearings
001467Y017 Bell for bearings, outside Ø 39 mm
Suspensions MP3 250 i.e.
SUSP - 2
- Remove the oil seal on the roller bearing side
using a screwdriver.
- Remove the roller bearing using the specific tool
Specific tooling020376Y Adaptor handle
020456Y Ø 24 mm adaptor
020363Y 20 mm guide
- Heat the roller bearing seat with a heat gun
- Use the specific tool to introduce and push the
bearing until it stops, with the shielded side facing
out
- Refit the ball bearing locking seeger ring
Specific tooling020151Y Air heater
020376Y Adaptor handle
020359Y 42x47-mm adaptor
020412Y 15 mm guide
- Use the specific tool to fit and push the roller cas-
ing until it stops
- Refit the oil seal on the roller bearing side
- Lubricate the area between the roller bearing and
the ball bearing
Specific tooling020038Y Punch
Recommended productsAGIP GREASE MU3 Grease for odometertransmission gear case
MP3 250 i.e. Suspensions
SUSP - 3
Soap-based lithium grease with NLGI 3; ISO-L-
XBCHA3, DIN K3K-20
Handlebar
Removal
• Remove the two handlebar covers as
explained in the Bodywork Chapter.
• Remove the handlebar wiring fixing
clips and disconnect the electric con-
nectors from the brake levers.
• Unscrew the fittings, then remove the
front and rear brake pump piping.
• Remove the flexible transmission of
the accelerator and remove the throt-
tle.
• Loosen the clamp fixing the handlebar
to the steering tube and pulling up-
wards, remove the handlebar, then re-
move the lower plastic cover.N.B.
IF THE HANDLEBAR IS BEING REMOVED TOREMOVE THE STEERING, IT IS ONLY NECES-SARY TO TILT THE HANDLEBAR FORWARDONTO THE FRONT PART OF THE VEHICLEWITHOUT REMOVING THE PARTS FITTED SOAS TO AVOID DAMAGING THE SHAFTS.
Refitting
Carry out the above operations by working in the reverse order from those of the removal.
Locking torques (N*m)Handlebar fixing screw 50 ÷ 55
The tilt mechanism
Suspensions MP3 250 i.e.
SUSP - 4
Hydraulic system layout
When tilting is locked, the geared motor activates
the hydraulic pump indicated in the photograph
and pressurises the circuit.
The pressurised oil reaches the distribution frame
"T" and the pressure sensor "A". Then, the pipes
branch out to reach the upper joints on the side
steering tubes.
Through the rigid-flexible pipes inside the side
steering tubes, the oil reaches the stem sliding
locking device placed parallel to the shock absorb-
er.
Steering tubes
Remove the brake calliper pipe retainers and the
hydraulic pipe fitting from the brake calliper making
sure there is a container to collect the brake fluid.
MP3 250 i.e. Suspensions
SUSP - 5
Disconnect the tone wheel connector indicated in
the photograph.
Remove the hydraulic pipe fitting from the sliding
locking device, making sure again that the liquid
drained is collected.
Remove the upper fittings, on the parallelogram,
of the brake hydraulic pipes and the suspension
lock indicated in the photograph.
Remove the hydraulic pipe fitting fixing nuts indi-
cated in the figure from the support bracket.
Suspensions MP3 250 i.e.
SUSP - 6
Remove the suspension tilt locking device pipes
from the headstock.
Remove first the flexible part of the calliper from
the steering tube as shown in the photograph, and
then remove the rigid part.
Remove the tone wheel wiring by disconnecting
the connector on the fuel tank after removing the
chassis central cover.
After that, remove the retainers indicated in the
figure.
MP3 250 i.e. Suspensions
SUSP - 7
Remove the constant-velocity universal joint from
the steering bar by undoing the nut indicated in the
photograph.
Use a specific tool to remove the upper tightening
ring nut of the steering tube.
Specific tooling020055Y Wrench for steering tube ring nut
Remove the hydraulic pipe support bracket.
Suspensions MP3 250 i.e.
SUSP - 8
Remove the steering tube lower ring nut and the
protection cap indicated in the photograph.
Now, it is possible to remove the steering tube.
Check that the roller tapered bearing does not
show signs of abnormal wear. If it is, replace it.
MP3 250 i.e. Suspensions
SUSP - 9
THE OPERATIONS DESCRIBED BELOW CAN
ALSO BE CARRIED OUT EVEN WHEN THE
SUSPENSION IS FITTED
Remove the lower retainer of the sliding stem
shown in the photograph.
Remove the sliding stem locking device retainers
indicated in the photograph.
Check that the sliding stem locking device does
not show signs of abnormal wear.
Suspensions MP3 250 i.e.
SUSP - 10
For refitting, follow the operations for removal but
in reverse order, observing the prescribed torques
and greasing the bearings and their seats.
STEERING TUBES
Name Torque in NmSide headstock upper ring nut 20 - 24Side headstock lower ring nut 12 ÷ 15
Screw fixing sliding stem to shock absorber 45 ÷ 50Clamp for sliding stem locking device 6.5 ÷ 10.5
Fixing nuts for constant-velocity universal joints 18 ÷ 20
Parallelogram device
Remove the steering tubes.
To facilitate removal operations of the brake disc
sector, loosen the 3 fixing screws in the hydraulic
electro-actuator indicated in the photograph.
Remove the hydraulic pipe retainers from the par-
allelogram.
MP3 250 i.e. Suspensions
SUSP - 11
Remove the 4 screws fixing the tilt brake disc sec-
tor indicated in the photograph.
Remove the retainers indicated in photograph of
the half-arms joint flange.
To facilitate the operations indicated below, re-
move the suspension locking electronic control
unit indicated in the photograph.
Suspensions MP3 250 i.e.
SUSP - 12
Remove the arm coupling retainers from the par-
allelogram by loosening the retainers indicated.
For easy refitting operations, remember to take
note of the positions of the components.
Separate the half-arms by hitting slightly with a
wooden mallet where possible alternatively to the
left and right side of the parallelogram.
Remove the headstocks.
MP3 250 i.e. Suspensions
SUSP - 13
Carry out a visual check of the upper and lower
bearings on the headstocks and their seats. Re-
place them in case of signs of abnormal wear.
Suspensions MP3 250 i.e.
SUSP - 14
Check the ball bearings on the parallelogram
arms. Replace them in case of signs of abnormal
wear.
Check the inside tracks of the parallelogram bear-
ings on the chassis.
For refitting, follow the operations for removal but
in reverse order, lubricating the locking pins on the
parallelogram half-arms and observing the pre-
scribed torques.
PARALLELOGRAM DEVICE
Name Torque in NmArm coupling screws 45 ÷ 50
Screws fixing arms to side headstocks 45 ÷ 50Screws fixing arms to central headstock 45 ÷ 50
Screws fixing the half-arm coupling flange 20 ÷ 25
MP3 250 i.e. Suspensions
SUSP - 15
Name Torque in NmFixing screws for tilt locking disc section 20 ÷ 25
Geared motor and Suspension locking system
Before removing the geared motor:
Disable the suspension lock.
- Remove the front shield.
With the set nut indicated in the photograph, re-
move the tensioning cable of the suspension lock-
ing mechanical calliper.
Remove the electrical connection of the geared
motor position potentiometer.
Remove the electrical connection of the geared
motor electric motor.
Disconnect the hydraulic pipes between the pump
and the sliding stem locking clamps. Empty the
system and use a container to collect the brake
fluid.CAUTIONELIMINATE ANY REMAINING BRAKE FLUIDSPILLS.
WARNING: BRAKE FLUID IS HIGHLY POISON-OUS. DO NOT INGEST OR SWALLOW. IF AC-CIDENTALLY SWALLOWED, DRINK LARGE
Suspensions MP3 250 i.e.
SUSP - 16
QUANTITIES OF MILK OR WATER AND SEEKMEDICAL ADVICE IMMEDIATELY. BRAKEFLUID DESTROYS SKIN AND OCULAR TIS-SUE. IF YOU ACCIDENTALLY SPILL BRAKEFLUID ON YOURSELF, TAKE OFF YOURCLOTHES, WASH WITH HOT WATER ANDSOAP AND SEEK MEDICAL ADVICE IMMEDI-ATELY. IF BRAKE LIQUID GETS ACCIDEN-TALLY IN CONTACT WITH YOUR EYES, RINSEWITH ABUNDANT FRESH WATER AND SEEKMEDICAL ADVICE IMMEDIATELY. KEEPBRAKE FLUID OUT OF THE REACH OF CHIL-DREN.
Remove the 3 fixing screws indicated and remove
the whole geared motor.
Use a screwdriver to remove the plastic access
cover to the pump joint/geared motor
Unscrew the pump joint screw.
Unscrew the two geared motor pump locking
screws.
MP3 250 i.e. Suspensions
SUSP - 17
Unscrew the two potentiometer screws.
When refitting, plug the potentiometer in D-type
connector, afterwards place it with its electric con-
nection directed to the opposite side of the pump.
Remove the nut indicated in the figure, if neces-
sary lock the lever with a vice making sure not to
spoil the surface.
In case of difficulties when removing the lever, use
the specific tool.
Remove the tongue and then, the moulded wash-
er.
Specific tooling020234y extractor
Remove the three fixing screws of the electric mo-
tor.
It is important to mark the direction of the electric
motor position in order to refit it correctly.
Suspensions MP3 250 i.e.
SUSP - 18
Remove the four screws indicated in the figure,
remove the flexible transmission supporting brack-
et, separate the two crankcase halves, if neces-
sary, use a rubber mallet to hit the flexible
transmission lever in order to separate the two
crankcases.
Remove the retaining seeger ring of the bearing of
the flexible transmission lever control shaft bear-
ing.
Remove the bearing with the specific tool.
Specific tooling020376Y Adaptor handle
020441Y 26 x 28 mm adaptor
020362Y 12 mm guide
Extract the electric motor bearing with the specific
tool.
Specific tooling020376Y Adaptor handle
020375Y Adaptor 28 x 30 mm
020363Y 20 mm guide
MP3 250 i.e. Suspensions
SUSP - 19
Hold the crankcase in a perfectly horizontal posi-
tion, heat it with a heat gun at a temperature of
about 120 °C, use the specific tool to fit the bearing
of the flexible transmission lever control shaft. Hit
slightly with a mallet if necessary.
Refit the bearing check seeger ring.
Specific tooling020151Y Air heater
020376Y Adaptor handle
020362Y 12 mm guide
020357Y 32 x 35 mm adaptor
Hold the crankcase in a perfectly horizontal posi-
tion, heat it with a heat gun at a temperature of
about 120 °C, use the specific tool to fit the bearing
of the electric motor. Hit slightly with a mallet if
necessary.
Specific tooling020363Y 20 mm guide
020358Y 37x40-mm adaptor
020151Y Air heater
020376Y Adaptor handle
Remove the spring/toothed sector unit from its fit-
ting, slightly hit with a mallet if necessary to release
the unit.
Suspensions MP3 250 i.e.
SUSP - 20
Extract the bearing of the spring/toothed sector
unit with the specific tool.
Specific tooling001467Y002 Driver for OD 73 mm bearing
Extract the bearing of the electric motor with the
specific tool.
Hold the crankcase in a perfectly horizontal posi-
tion, heat it with a heat gun at a temperature of
about 120 °C, use the specific tool to fit the bearing
of the spring/toothed sector unit. Hit slightly with a
mallet if necessary.
Specific tooling020360Y Adaptor 52 x 55 mm
020151Y Air heater
020376Y Adaptor handle
Hold the crankcase in a perfectly horizontal posi-
tion, heat it with a specific heat gun at a tempera-
ture of about 120 °C, use the specific tool to fit the
bearing of the electric motor. Hit slightly with a
mallet if necessary.
Specific tooling020363Y 20 mm guide
020151Y Air heater
020376Y Adaptor handle
020477Y Adaptor 37 mm
MP3 250 i.e. Suspensions
SUSP - 21
Refit the spring/toothed sector unit, hold the crank-
case in a perfectly horizontal and stable position,
place the spring/toothed sector unit keeping it per-
fectly perpendicular to the bearing already fitted on
the crankcase; if necessary, slightly hit the unit
shaft end with a mallet and protect the thread by
screwing in a nut.
Fit the pinion and align the reference on the pinion
teeth with the reference indicated on the second
slot of the toothed sector.
Grease the pinion and the toothed sector with spe-
cific grease.
Refit the toothed sector spacer.
Recommended productsMONTBLANC MOLYBDENUM GREASE MON-TBLANC MOLYBDENUM GREASE
Molybdenum disulphide grease
Lubricate the interference areas, match the crank-
case halves with slight hits of a mallet to get them
into contact.
Place the flexible transmission supporting bracket,
refit the four screws, screw them to the prescribed
torque.
Locking torques (N*m)Geared motor crankcase halves couplingscrews 11 ÷ 13
Suspensions MP3 250 i.e.
SUSP - 22
Refit the electric motor; check the position is cor-
rect by means of the reference indicated during
removal.
The motor should be so positioned that it does not
protrude from the reduction unit mould, see figure.
Tighten the screws to the prescribed torque.
Locking torques (N*m)Electric motor coupling screws 11 ÷ 13
Place the moulded washer of the flexible trans-
mission control lever shaft and the tongue.
Refit the flexible transmission control lever as
shown in the figure.
Refit the potentiometer (not forcing in the D-type
connector ensures a sole position) with the con-
nector directed to the opposite side of the hydraulic
pump.
Refit the hydraulic pump on the geared motor body
and tighten the screws to the prescribed torque.
Fit but not tighten the pump stem coupling screw
and refit the plastic protection cap.
The synchronisation procedure should be com-
plete when the installation is finished.
Locking torques (N*m)Geared motor hydraulic pump tighteningscrews 11 ÷ 13
MP3 250 i.e. Suspensions
SUSP - 23
Remove the two bracket screws after releasing the
spring and freeing the flexible transmission adjust-
ment.
CAUTION: A FIRST PRODUCTION BATCH WILL
BE EQUIPPED WITH DOUBLE COAXIAL
SPRING.
It is very important to remove the flexible trans-
mission from its fitting only for replacement.
When refitting, tighten the two bracket screws and
the flexible transmission lever nut to the prescribed
torque.
Locking torques (N*m)Bracket tightening screws 8 ÷ 12
Unscrew the Allen screw and remove the switch.
When refitting, place the switch with the button ori-
ented to the stop indicated on the calliper lever;
observing the reference indicated on the switch
supporting bracket.
After refitting, check in detail that the switch is reg-
ularly activated by the stop on the lever.
Suspensions MP3 250 i.e.
SUSP - 24
Unscrew the two pad pin screws, remove the pads
with the spring.
When refitting, tighten the two screws to the pre-
scribed torque and use Threadlock.
When refitting, adjust the cable properly so that the
switch is pushed when the system is unlocked.
MP3 250 i.e. Suspensions
SUSP - 25
Select the SYSTEM RESET option from the main
menu
Turn the key switch to ON
Select the LOWER STOP SEARCH option from
the SYSTEM RESET menu
WAIT
PROCEDURE IN PROGRESS
Suspensions MP3 250 i.e.
SUSP - 26
The hand-held computer indicates the outcome of
the stop search operation:
POSSIBLE LIMIT STOP VALUES. TO EXIT,
PRESS A KEY AND TURN OFF AND ON. SE-
LECT PARAMETERS TO ADJUST AT 12°.
Check the geared motor if the hand-held computer
does not indicate this.
Select the PARAMETERS option from the main
menu
The hand-held computer displays the option: REL-
ATIVE POTENTIOMETER ANGLE
This function is active coming from the LOWER
STOP SEARCH procedure.
NOTE: a slight oscillation of the angle value be-
tween 0.00° and 0.50° is considered normal
Remove the protection cap of the geared motor set
screw
Use a plain slot screwdriver to turn the set screw
anticlockwise until replicating the 12° condition on
the hand-held computer
RELATIVE POTENTIOMETER ANGLE 12° (a
slight value oscillation is considered normal)
Refit the protection cap
MP3 250 i.e. Suspensions
SUSP - 27
Remove the protection cap, align the pump control
and lock the screw to the prescribed torque
Locking torques (N*m)Clamp fixing pump bolt to anti-tilting device 11÷ 13
Select the SYSTEM RESET option from the MAIN
menu
Suspensions MP3 250 i.e.
SUSP - 28
Select the POTENTIOMETER RESET option from
the SYSTEM RESET menu and press OK.
WAIT....
PROCEDURE IN PROGRESS
The hand-held computer displays the words:
CHECK THAT THE CONTROL IS SET AT 12°
FROM THE LOWER STOP. PRESS OK TO CON-
TINUE
Press OK
The hand-held computer displays the words: POS-
SIBLE LIMIT STOP VALUES. PRESS A KEY AND
SHIFT OFF AND ON
If this is not successful, the tilt locking mechanism
remains locked for safety.
Adjust the flexible transmission so that a small
clearance is left to guarantee switch activation on
the tilt locking calliper
Electrical devices testPRINCIPLE DIAGRAM FOR TILT LOCKING ELECTRICAL SYSTEM
MP3 250 i.e. Suspensions
SUSP - 29
1. GEARED MOTOR
2. TILT LOCKING CALLIPER SWITCH
3. TILT UNLOCKING-LOCKING CONTROL SWITCH
4. POTENTIOMETER
5. RIDER PRESENCE SENSOR
6. LEFT SPEED SENSOR
7. RIGHT SPEED SENSOR
8. DIAGNOSTIC TESTER SERIAL LINE
9. ENGINE CONTROL UNIT
10.+ DIRECT BATTERY
11.+ LIVE BATTERY
12.LOW-BEAM LIGHT
13.FUSE No. 3, 20A
14.LOW-BEAM LIGHT REMOTE CONTROL
15.PRESSURE SWITCH
16.HORN REMOTE CONTROL
17.INSTRUMENT PANEL
18.TILT LOCKING SYSTEM CONTROL UNIT
TONE WHEEL SENSOR
Suspensions MP3 250 i.e.
SUSP - 30
1: Right tone wheel
2: Left tone wheel
With interface wiring disconnected from the park-
ing electrical control unit and connected to the
system, check that the sensor resistance between
pins 23 - 17 and 24 - 17 is between 774 and 946
Ohm at a temperature of approximately 20°
With interface wiring disconnected from the control
unit, check the continuity between pin 23 and the
brown cable of the LEFT wheel revolution sensor
connector; between pin 17 and the red cables of
the LEFT wheel revolution sensor and brown cable
of the RIGHT sensor; between pin 24 and the red
cable of the RIGHT wheel revolution sensor
MP3 250 i.e. Suspensions
SUSP - 31
In case of failures, check the continuity between
pin 23 and the connector green cable on the fuel
tank after removing the chassis central cover; be-
tween pin 17 and the yellow cables on both con-
nectors; between pin 24 and the red cable on the
connector.
With interface wiring disconnected from the control unit and the connectors disconnected from wheel
turning sensors, check that pin 23 - 17 and 24 - 17 are insulated from each other and from earth.
Suspensions MP3 250 i.e.
SUSP - 32
With a thickness gauge, check that the air gap be-
tween the screw head and the sensor is between
0.35 and 1 mm
RIDER PRESENCE SENSOR
MP3 250 i.e. Suspensions
SUSP - 33
1: RIDER PRESENCE SENSOR
With interface wiring disconnected from the control
unit and connected to the system, check the fol-
lowing conditions:
pin 17 - 36: resistance 15 ÷ 18 kOhm when the
rider is not seated on the saddle.
pin 17 - 36: resistance of about 3 kOhm when the
rider is seated on the saddle
Suspensions MP3 250 i.e.
SUSP - 34
Check the continuity between the interface wiring
pin 17 and the yellow cable of the rider presence
connector.
Check the continuity between the interface wiring
pin 36 and violet cable of the rider presence con-
nector.
TILT LOCKING GRIPPER SENSOR
1: TILT LOCKING CALLIPER SENSOR
MP3 250 i.e. Suspensions
SUSP - 35
The tilt locking calliper sensor is a normally opened
switch. Check its correct operation with a multi-
meter.
With interface wiring disconnected from the control
unit, check the continuity between pin 34 and the
brown cable of the tilt locking gripper sensor con-
nector on the system side.
Check the continuity of the connector black cable
and an earth point on the chassis
Also check that the flexible transmission control
lever activates the limit stop switch properly.
POTENTIOMETER
Suspensions MP3 250 i.e.
SUSP - 36
1: POTENTIOMETER
With interface wiring connected to the control unit,
secure the vehicle on its centre stand and switch
to "ON". Select the reading scale on 20 V. Insert
the multimeter probes on pins 17 (black) and 25
(red). Check that the voltage in the activated lock-
ing condition is 4V and 1V in the locking rest
condition.
MP3 250 i.e. Suspensions
SUSP - 37
With the interface wiring disconnected from the
control unit, check the continuity between pin 17
and the yellow cable of the potentiometer connec-
tor, between pin 25 and the green-blue cable,
between pin 11 and the orange-blue cable. Also
check that these lines are insulated from each oth-
er and earth.
TILT LOCKING-UNLOCKING SWITCH
Suspensions MP3 250 i.e.
SUSP - 38
0: REST POSITION
1: LOCKING POSITION
2: UNLOCKING POSITION
3: TILT LOCKING-UNLOCKING SWITCH
With interface wiring disconnected from the control
unit, check the continuity of the electrical lines be-
tween the interface wiring and the tilt locking-un-
locking switch:
Pin 26 and green - grey cable
Pin 35 and violet - black cable
Pin 33 and yellow - blue cable
Also check that the above indicated electrical lines
are insulated from the earth.
MP3 250 i.e. Suspensions
SUSP - 39
Check the continuity between the black cable on
the connector and an earth point on the chassis.
With a multimeter, check the operation of the tilt
locking-unlocking switch referring to the diagram
indicated in the figure.
1. EARTH
2. LOCK
3. REST
4. UNLOCK
GEARED MOTOR
Suspensions MP3 250 i.e.
SUSP - 40
1: GEARED MOTOR
With the interface wiring disconnected from the
control unit, check the continuity between pin 28
and the yellow cable, between pin 38 and the blue
cable on the geared motor connector
MP3 250 i.e. Suspensions
SUSP - 41
With the interface wiring disconnected from the
control unit, check the continuity of the geared mo-
tor winding placing the multimeter probes on pins
28 and 38 as indicated in the figure
PRESSURE SWITCH
1: PRESSURE SWITCH
2: HORN REMOTE CONTROL
3: FUSE No. 11, 7.5A
Suspensions MP3 250 i.e.
SUSP - 42
Check 7.5 A fuse No. 11 for efficiency. With inter-
face wiring disconnected from the control unit,
check the continuity of the blue - black cable be-
tween pressure sensor connector and the horn
remote control base as indicated in the photo-
graph. Check the continuity between pin 27 and
the remote control base white cable.
Check the continuity of the yellow - red cable be-
tween the pressure switch connector and the fuse-
box and between the remote control base and the
fuse-box.
With a multimeter, also check the pressure switch
operation as well as the continuity at rest as this is
normally closed switch.
MP3 250 i.e. Suspensions
SUSP - 43
Wheel alignment
Tool fitting
Metodo di utilizzo dell'attrezzatura
• Verificare che la pressione pneumatici
sia corretta.
• Posizionare il veicolo su un pavimento
piano privo di asperità e irregolarità .
• Posizionare il veicolo sul cavalletto
centrale.
• Assicurarsi che il sistema di staziona-
mento sia sbloccato.
• Sollevare le ruote anteriori come mos-
trato in foto
• Verificare la regolarità di rotazione dei
cerchi ruota e l'eventuale presenza di
giochi anomali dei cuscinetti e delle so-
spensioni.
• Verificare che il comando dello sterzo
non presenti giochi anomali su giunti e
cuscinetti. In caso contrario procedere
con le necessarie riparazioni e succes-
sive regolazioni.
CharacteristicFront tyre pressure (rider)
Front tyre pressure (rider): 1.6 bar
Rear tyre pressure (rider)
Rear tyre pressure (rider): 2 bar
Suspensions MP3 250 i.e.
SUSP - 44
• Get the vehicle off the stand, back on
the ground.
• Remove the right lower coupling plate
of the half-arm by undoing the screws
indicated in the photograph.
• Remove the right upper screw and the
left bottom screw of the parallelogram
unit .
MP3 250 i.e. Suspensions
SUSP - 45
• Fit the bracket locking the parallelo-
gram in the holes of the previously re-
moved screws; use the screws sup-
plied with the tool and be careful to
correctly centre the spacer in the bear-
ing.
• Remove the nut fixing the steering con-
trol arm and keep the original washer
in position.
• Fit the steering guiding bracket in a
straight riding position, fix one end to
the attachment of the half-arm coupling
flange and the other end to the screw
fixing the steering control arm.
• Place the frame so that the sliders
come into contact with the rim maxi-
mum diameter but without interfering
with the tyre. If required, reposition the
frame by operating the 3 adjustable
support feet.
Suspensions MP3 250 i.e.
SUSP - 46
• Fit the frame locking bracket
• Make sure the frame is adequately
centred by checking with a gauge that
the lugs along the vertical axis show
the standard protrusion.
• Check that the pointers of both tyres
are correctly aligned, as shown in the
photograph. Maximum misalignment
allowed: 4 notches
MP3 250 i.e. Suspensions
SUSP - 47
Rear
Removing the rear wheel
Remove the full muffler assembly.
- Remove the screw fixing the right-hand shock
absorber to the bracket
- Remove the two screws supporting the brake
calliper on the bracket
- Remove the cotter pin, the cap, the wheel axle
fixing nut and the outer one of the two spacers.
Suspensions MP3 250 i.e.
SUSP - 48
- Remove the mud guard clamping screw
- Remove the two screws fixing the bracket to the
engine
- Undo the wheel axle bracket, using the heat gun if necessary.
Refitting the rear wheel
To fit, follow the removal steps but in the reverse
sequence, being careful to fit the spacers on the
wheel axle as shown in the photograph.
Locking torques (N*m)Muffler arm clamping screws 27 ÷ 30 Rearwheel axle nut 104 ÷ 126 Shock absorber-crankcase attachment bracket 20 ÷ 25 Lowershock absorber clamping screw 33 ÷ 41 NmRear brake calliper fixing screws 25 ÷ 30 Nm
Swing-arm
Removal
- Place the scooter on its centre stand;
- Remove the swinging arm/engine fitting shown in
the photo
- Move the engine back
MP3 250 i.e. Suspensions
SUSP - 49
- remove the spring anchoring the swinging arm to
the frame as shown in the photo
- Remove the two screws fixing the buffer support
bracket to the frame
- Undo the nut on the LHS shown in the figure and
remove the corresponding bolt from the opposite
side.
- Remove the swinging arm.
- Check the entire swinging arm assembly.
- Check all the centring bushing components and
silent block rubber buffers.
- Replace the work components that cause exces-
sive clearance on the rear suspension.
Suspensions MP3 250 i.e.
SUSP - 50
Refitting
For correct installation of the swinging arm on the
scooter, proceed as follows:
1. Position the silent block supporting clamp with
part 3 inserted, and slightly tighten part 1
2. Position the swinging arm, inserting part 2
3. Tighten part 3 to the prescribed torque
4. Screw on and tighten part 4 to the prescribed
torque
5. Screw on and tighten part 5 to the prescribed
torque
6. Tighten part 1 to the prescribed torque
Insert the swinging arm - engine bolt and tighten
to the prescribed torque
MP3 250 i.e. Suspensions
SUSP - 51
SWINGING ARM FITTING
Name Torque in NmPart 1 64 ÷ 72 NmPart 3 5 - 7 NmPart 4 90 ÷ 110 NmPart 5 64 ÷ 72 Nm
Engine-swinging arm bolt 64 - 72
Shock absorbers
Removal
Proceed as follows:
- place the scooter on its centre stand;
- lift the engine a little with a jack so as to free the
two shock absorbers;
- remove the muffler
- undo the shock absorber spring assembly clamp-
ing screw from the support fixed to the engine on
the one side and from that fixed to the muffler on
the other;
- undo the two upper nuts (one on each side) fixing
the shock absorber spring assembly to the frame
and remove the shock absorbers themselves.
RefittingCarry out the previous operations but in reverse order.
Locking torques (N*m)
Suspensions MP3 250 i.e.
SUSP - 52
Shock absorber lower clamp 33 ÷ 41 Upper shock absorber clamp 33 ÷ 41
Centre-stand
REMOVAL
- Use a jack to support the vehicle properly.
- Remove the two return springs from the centre
stand.
- Undo the nut shown in the figure.
- Remove the bolt from the right side.
- Remove the centre stand.
FITTING
- On refitting tighten the nut to the specified torque.
Locking torques (N*m)Centre stand bolt 31 ÷ 39
MP3 250 i.e. Suspensions
SUSP - 53
Suspensions MP3 250 i.e.
SUSP - 54
INDEX OF TOPICS
BRAKING SYSTEM BRAK SYS
This section è is devoted to the description of the braking system components.
Rear brake calliper
Removal
- Remove the muffler.
- Remove the two rear brake calliper devices fas-
tening them to the support as shown in the photo-
graph.N.B.
IF IT IS NECESSARY TO REPLACE OR SERV-ICE THE BRAKE CALLIPER, BEFORE REMOV-ING THE FITTINGS FIXING THE CALLIPER TOTHE SUPPORT BRACKET, FIRST LOOSENTHE OIL HOSE FITTING AFTER HAVING EMP-TIED THE SYSTEM OF THE CIRCUIT BEINGEXAMINED.
Removal
Place a container under the calliper, unscrew the
tube-calliper joint and empty the braking system.
For easy draining of the braking system fluid, open
the pump reservoir cap.
Loosen the two screws indicated in the figure and
remove the calliper from the support.
When refitting, tighten the two calliper retainers to
the prescribed torque.
Locking torques (N*m)Screw tightening calliper to the support 24 ÷ 27
Braking system MP3 250 i.e.
BRAK SYS - 2
Removal
Remove the split pin.
Use new split pins when refitting.
Undo the wheel hub nut.
- When refitting, secure to the specified torque.
Locking torques (N*m)Wheel axle nut 74 ÷ 88
Remove the seeger ring, after that, remove the
hub with the help of a rubber mallet slightly hitting
on the brake disc side, turning the wheel hub at the
same time.
Loosen the 6 screws indicated in the figure and
remove the brake disc from the wheel hub.
- When refitting, secure to the specified torque.
Recommended productsLoctite 242 product description
Apply LOCTITE medium type 242 threadlock
MP3 250 i.e. Braking system
BRAK SYS - 3
Removal
Rest the vehicle on its centre stand and use the
corresponding jack to lift the two front wheels; un-
screw the five Allen screws indicated in the figure
Remove the pad upper closing cap.
Remove the pad pin lock with a screwdriver, pay-
ing attention not to spoil the calliper surface treat-
ment.
Use a corresponding measuring punch to extract
the pad pin, if necessary move the brake pipes
manually to release the pin.
Then, remove the spring and the pads.
Fit a new pad kit following the procedure but in re-
verse order.
Locking torques (N*m)Wheel fixing screw 20 ÷ 25
Brake pipesFront brake pipes removal
Braking system MP3 250 i.e.
BRAK SYS - 4
Remove front Shield.
Remove front wheel and mudguard.
Disconnect the brake pipes from the calliper and
drain the brake fluid.
Then, remove the plastic and metallic straps.
Unscrew the brake pump pipes as indicated in the
figure.
Front brake pipes removal
Unscrew the braking splitter screw.
Disconnect the brake pipes removing the two met-
allic straps indicated in the figure.
Remove the brake oil tube fitting from the rigid pipe
inside the front suspension arm and loosen the
hydraulic joint fixing nut of the suspension locking
to release the brake pipes.
MP3 250 i.e. Braking system
BRAK SYS - 5
Parking brake
Remove the muffler loosening the 3 screws and
the strap on the drainage tube indicated in the
photograph.
When refitting, place the parking brake flexible
transmission retaining strap correctly.
Loosen the transmission set screw and release the
cable from the calliper.
Remove the two fixing screws of the mechanic
calliper and remove the calliper. To check calliper
components, refer to the chapter on the tilt locking
calliper.
When refitting, secure to the specified torque.
Locking torques (N*m)Screw tightening calliper to the support 20 ÷ 25
After removing the shield back plate, remove the
engaging cable for the safety mechanism remov-
ing it from its fitting.
Remove the 4 screws shown in the figure.
When refitting, pay attention to insert the metallic
cable peg in the fitting marked «A» as indicated in
the enlarged photograph.
Braking system MP3 250 i.e.
BRAK SYS - 6
Remove the electric connection from the engaged
parking brake warning light switch.
Remove the parking brake cable from the lever by
operating the set screw indicated in the photo-
graph.
MP3 250 i.e. Braking system
BRAK SYS - 7
Braking system MP3 250 i.e.
BRAK SYS - 8
INDEX OF TOPICS
COOLING SYSTEM COOL SYS
System bleed
- Start up the engine until the operating tempera-
ture is reached.
- Remove the rubber hood over the bleed valve
- Obtain a rubber tube that is of the right length to
connect the valve to the expansion tank
- Place one end of the pipe on the bleed valve and
the other in the expansion tank
- Loosen the screw by two turns until the commu-
nication hole is revealed with the head as shown
in the photo
- Wait until only coolant comes out of the rubber
pipe so as to eliminate any air bubbles inside the
circuit.
- Tighten the bleed valve respecting the maximum
torque.
- Bring the coolant up to the correct level inside the
expansion tank
Locking torques (N*m)Bleed screw: 3
Cooling system MP3 250 i.e.
COOL SYS - 2
INDEX OF TOPICS
CHASSIS CHAS
This section è is devoted to the operations that can be carried out on the vehicle's bodywork.
Seat
Lift the saddle and disconnect the rider presence
sensor.
Remove the three fixing screws.
Front handlebar cover
Remove the upper cap by operating on the Allen
screw indicated in the figure.
Remove the two brake pump caps.
Chassis MP3 250 i.e.
CHAS - 2
Remove the two screws under the brake pump
caps previously removed.
Unscrew the two pairs of screws in the lower part
of the half-handlebar.
After removing the front part of the handlebar cov-
er, access the two screws fixing the rear part to the
handlebar, as indicated in the photograph.
Headlight assy.
Remove the radiator cover.
Remove the two wheelhouses with the turn indi-
cator.
Unscrew the two screws fixing the wheelhouse to
the shield.
Disconnect the cable guide; after that, turn the
wheelhouse anticlockwise (inwards) to release it
from the shield supports.
MP3 250 i.e. Chassis
CHAS - 3
To remove the shield central finishing, remove the
PIAGGIO clip-on badge paying attention not to
spoil the paint, unscrew the screw underneath and
remove the finish carefully.
Remove the four screws "A" and disconnect the
wiring.
See alsoRadiator cover
Frame central cover
Remove the three screws on the right and the left
side.
Open the refuelling compartment and remove the
tank cap so as to remove the central cover.
Disconnect the cable, refuelling compartment
opening.
See alsoSeatKnee-guardHandles and top side fairings
Chassis MP3 250 i.e.
CHAS - 4
Legshield
Remove the front headlight assembly.
Remove the spoiler.
Remove the two front screws and the two screws
under the wheelhouse.
Remove the four screws on the shield back plate.
See alsospoilerHeadlight assy.
Knee-guard
- Remove the front shield.
- Remove the spoiler.
- Remove the two central screws and the coolant
cap cover screw.
MP3 250 i.e. Chassis
CHAS - 5
- Remove the expansion tank fixing screw and the
frame from the instrument panel and manually re-
lease the unions with the shield back plate.
- Unhook the instrument panel wiring.
- Remove the six screws and the cable guide strap
in the front part of the shield back plate.
- Remove the key switch plastic ring and the two
plastic covers near the footrest.
Chassis MP3 250 i.e.
CHAS - 6
- Remove the five screws on the shield back plate
rear part.
- Remove the two shield back plate front screws,
see figure.
- Remove the two shield back plate lower screws.
- Remove the external temperature sensor con-
nection.
See alsoLegshieldspoiler
Taillight assy.
Open the rear case cover, remove the two screws
«D», and then, the other four fixing screws «D» to
pull out the headlight assembly from its fitting.
Follow this procedure to remove the bulbs:
Remove the snap-on bulbs «B».
Remove the bulbs «A» on the bayonet by turning
them 30° clockwise.
MP3 250 i.e. Chassis
CHAS - 7
Footrest
Remove the central cover.
Remove the four screws and extract the half-foot-
rest.
Follow the same procedure for both half-footrests.
Release the fuse-box
See alsoFrame central cover
Chassis MP3 250 i.e.
CHAS - 8
Side fairings
Remove the rear screw under the rear cover.
Remove the screw on the fairing front part, pull the
fairing to release the hooks.
Follow the same procedure for both fairings.
Remove the five screws on the right side and the
five on the left side, indicated in the figure.
License plate holder
Remove the two lateral screws and the two screws
inside the rear case.
Operate a slight upwards thrust on the case to re-
lease license plate support from the chassis.
MP3 250 i.e. Chassis
CHAS - 9
Helmet bay
Remove the chassis central cover.
Remove the four external screws and the two
screws inside the rear case to remove the frame.
Remove the upper frame, unscrewing the ten up-
per screws, the two saddle closing screws and the
case light wiring.
Chassis MP3 250 i.e.
CHAS - 10
Remove the rear case internal screws indicated in
the photograph, to detach the supporting plates of
the voltage regulator on one side and the saddle
opening switch on the other.
Remove the six upper screws.
Release the case latch.
Remove the case light front and rear switch con-
nections, the HV coil, the battery leads and the
fuse-box.
See alsoFrame central cover
spoiler
Remove the shield central finish; then, screw the
six screws indicated in the figure.
Remove the five screws indicated in the figure.
See also
MP3 250 i.e. Chassis
CHAS - 11
Headlight assy.
Fuel tank
Remove the chassis central cover.
Remove the footrest.
Remove the three tank retainers.
Remove the two lower bracket retainers indicated
in the figure.
Disconnect the electric wiring and the fuel pipes.
See alsoFootrest
Chassis MP3 250 i.e.
CHAS - 12
Top-case
Rear
Remove the four fixing screws of the cover and
release it from the two leverages.
Handles and top side fairings
• Operating from the rear case remove
the two screws indicated in the figure.
• Remove the ceiling fitting indicated in
the photograph and remove the inter-
nal screw indicated in the photograph.
• Remove the backrest cushion
MP3 250 i.e. Chassis
CHAS - 13
Remove the six screws indicated in the figure.
Radiator cover
Remove the two front screws indicated in the pho-
tograph
Remove the two lower retainers with the bushing
Remove the two rear retainers and then, the two
wheelhouse front retainers.
Chassis MP3 250 i.e.
CHAS - 14
Remove the two screws fixing the radiator lower
protection to the shield back plate.
After that, press up and pull the protection front
part so as to release it from the radiator frame.
MP3 250 i.e. Chassis
CHAS - 15
Chassis MP3 250 i.e.
CHAS - 16
INDEX OF TOPICS
PRE-DELIVERY PRE DE
Carry out the listed tests before delivering the vehicle.
Warning- be very careful when handling fuel.
Position the plastic cover supplied with the cou-
pling on the steering tube as shown in the figure.
If a customer wishes to have mudflaps installed,
proceed as follows:
• Place the flap in the mudguard inner
side as shown in the figure, making the
4 securing holes coincide.
• Fit the 4 washers on the mudguard out-
er side and, always on the same side,
insert the 4 screws and tighten to the
prescribed torque.
Locking torques (N*m)mudflap insert fixing screws 2 ÷ 3
Aesthetic inspection
Appearance checks:
- Paintwork
- Fitting of plastics
- Scratches
- Dirt
Tightening torques inspection
Lock check
- Safety locks
- clamping screws
Safety locks
• Rear shock absorber upper fixing
• Rear shock absorber lower fixing
Pre-delivery MP3 250 i.e.
PRE DE - 2
• Front shock absorber upper fixing
• Front shock absorber lower fixing
• Sliding stems fixing
• Break callipers fixing
• Front wheels fixing screws
• Front wheels axle nut
• Rear wheel axle nut
• Chassis - engine swinging arm fixing
• Handlebar lock nut
• Lower ring nut for side steering tubes
• Upper ring nut for side steering tubes
• Lower ring nut for central steering tube
• Upper ring nut for central steering tubes
• Constant-velocity universal joints
Electrical system
• Battery
• Main switch
• Lights: high beams, low beams, side/taillights (front and rear) and relevant warning lights
- Regulating the headlights according to the regulations currently in force
• Front and rear stop light buttons and bulb
• Turn indicators and their warning lights
• Instrument lighting
• instruments: fuel and temperature indicator
•Instrument panel lights
• Horn
• electric start up
• Engine stopping with emergency stop switch
• Electric opening of saddle with remote control
• Tilting system locking - unlocking buttonCAUTION
TO ENSURE MAXIMUM PERFORMANCE, THE BATTERY MUST BE CHARGED BEFORE USE.INADEQUATE CHARGING OF THE BATTERY WITH A LOW LEVEL OF ELECTROLYTE BEFOREIT IS FIRST USED SHORTENS THE LIFE OF THE BATTERY.CAUTION
WHEN INSTALLING THE BATTERY, ATTACH THE POSITIVE LEAD FIRST AND THEN THE NEG-ATIVE LEAD.WARNING
BATTERY ELECTROLYTE IS TOXIC AND IT MAY CAUSE SERIOUS BURNS. IT CONTAINS SUL-PHURIC ACID. AVOID CONTACT WITH EYES, SKIN AND CLOTHING.
MP3 250 i.e. Pre-delivery
PRE DE - 3
IN CASE OF CONTACT WITH EYES OR SKIN, RINSE WITH ABUNDANT WATER FOR ABOUT 15MINUTES AND SEEK MEDICAL ATTENTION AT ONCE.IF IT IS SWALLOWED, IMMEDIATELY DRINK LARGE QUANTITIES OF WATER OR VEGETABLEOIL. SEEK IMMEDIATE MEDICAL ATTENTION.THE BATTERIES PRODUCE EXPLOSIVE GAS; KEEP THEM AWAY FROM NAKED FLAMES,SPARKS AND CIGARETTES. IF THE BATTERY IS CHARGED IN A CLOSED PLACE, TAKE CARETO ENSURE ADEQUATE VENTILATION. ALWAYS PROTECT YOUR EYES WHEN WORKINGCLOSE TO BATTERIES.KEEP OUT OF THE REACH OF CHILDRENCAUTIONNEVER USE FUSES WITH A CAPACITY HIGHER THAN THE RECOMMENDED CAPACITY. USINGA FUSE OF UNSUITABLE RATING MAY SERIOUSLY DAMAGE THE VEHICLE OR EVEN CAUSEA FIRE.
Levels check
Level check:
- Hydraulic brake system liquid level.
- Tilt locking system fluid level
- Rear hub oil level
- Engine coolant level
- Engine oil level
Road test
Test ride
- Cold start
- Instrument operations
- Response to the gas command
- Stability on acceleration and braking
- Rear and front brake efficiency
- Parking brake efficiency
- Rear and front suspension efficiency
- Abnormal noise
- Tilting system locking - unlocking efficiency
Static test
Static control after the test ride:
• Hot engine restart
• Minimum seal (turning the handlebar)
• Uniform steering rotation
• Possible losses
• electric radiator fan operationCAUTION
Pre-delivery MP3 250 i.e.
PRE DE - 4
CHECK AND ADJUST TYRE PRESSURE WITH TYRES AT AMBIENT TEMPERATURE.CAUTION
NEVER EXCEED THE RECOMMENDED INFLATION PRESSURES OR TYRES MAY BURST.
Functional inspection
Functional check up:
• Hydraulic braking system: lever travel
• Clutch: proper functioning check
• Engine: proper general functioning and no abnormal noise check
• Other: papers check, frame and engine number check, tools and equipment, licence plate fitting, lock
check, tyre pressure check, rear-view mirror and any accessory fitting
MP3 250 i.e. Pre-delivery
PRE DE - 5
Pre-delivery MP3 250 i.e.
PRE DE - 6
INDEX OF TOPICS
TIME TIME
This section is devoted to the time necessary to carry out repairs.
For each operation, the description, code and time envisages are specified.
Engine
ENGINECode Action Duration
1 001001 Engine from frame - Removaland refit.
2 001127 Engine - Complete service3 003064 Engine oil - change
Time MP3 250 i.e.
TIME - 2
Crankcase
CRANKCASECode Action Duration
1 001133 Engine crankcase- Replace-ment
2 001099 Oil seal, flywheel side - Re-placement
3 001100 Oil seal, clutch side - Re-placement
4 001124 Lubrication by-pass - Re-placement
5 001153 Crankcase halves gasket -Replacement
MP3 250 i.e. Time
TIME - 3
Crankshaft
CRANKSHAFTCode Action Duration
1 001117 Crankshaft - Replacement
Time MP3 250 i.e.
TIME - 4
Cylinder assy.
CYLINDER GROUPCode Action Duration
1 001002 Cylinder-Piston - Replace-ment
2 001154 Pin ring piston unit - Service3 001176 Rings / Pin - Replacement
MP3 250 i.e. Time
TIME - 5
Cylinder head assy.
HEAD UNITCode Action Duration
1 001057 Thermostat - Replacement2 007012 Coolant bleed valve - Re-
placement3 001083 Thermistor - Replacement4 001056 Head gasket - Replacement5 001045 Valves - Replacement6 001049 Valves - Adjustment
Time MP3 250 i.e.
TIME - 6
Rocker arms support assy.
ROCKING LEVER UNITCode Action Duration
1 001148 Rocking lever valve - Re-placement
2 001126 Head - Replacement3 001044 Camshaft - Replacement4 001169 Decompressor - Replace-
ment
MP3 250 i.e. Time
TIME - 7
Cylinder head cover
HEAD COVERCode Action Duration
1 001089 Head cover - Replacement2 001093 Spark plug - Replacement3 001088 Head cover gasket - Replace-
ment4 001074 Oil vapour recovery pipe - Re-
placement5 001159 Oil vapour recovery tank -
Service
Time MP3 250 i.e.
TIME - 8
Oil filter
OIL FILTERCode Action Duration
1 001150 Flywheel cover gasket - Re-placement
2 001160 Oil pressure sensor - Re-placement
3 001123 Oil filter -Replacement4 001102 Net oil filter - Replacement /
Cleaning5 001113 Water pump / Pump rotor -
Replacement
MP3 250 i.e. Time
TIME - 9
Flywheel cover
FLYWHEEL COVERCode Action Duration
1 007009 Head-pump by-pass rubbercoupling - Replacement
Time MP3 250 i.e.
TIME - 10
Driven pulley
DRIVEN PULLEYCode Action Duration
1 001012 Driven pulley - Service2 001022 Clutch - Replacement3 001110 Driven pulley - Replacement4 001155 Clutch bell - Replacement
MP3 250 i.e. Time
TIME - 11
Oil pump
OIL PUMPCode Action Duration
1 001129 Chain tightener - Overhauland replacement
2 001125 Chain guide pads - Replace-ment
3 001122 Oil pump chain - Replace-ment
4 001172 Chain cover flap - change5 001130 Oil sump - Replacement6 001042 Oil pump - Service7 001112 Oil pump - change8 001051 Belt/Timing chain - Change
Time MP3 250 i.e.
TIME - 12
Final gear assy.
FINAL REDUCTION GEAR ASSEMBLYCode Action Duration
1 002031 Rear wheel hub bearings -Replacement
2 003065 Gear box oil - Replacement3 004180 Reduction gear pipe - Re-
placement4 004125 Rear wheel axle - Replace-
ment5 001179 Hub drive shaft -replacement6 001156 Gear reduction unit cover -
Replacement
MP3 250 i.e. Time
TIME - 13
Driving pulley
DRIVE PULLEYCode Action Duration
1 001177 Variator rollers / shoes - Re-placement
2 001141 Belt anti-flapping roller - Re-placement
3 001086 Driving half-pulley - Replace-ment
4 001011 Driving belt - Replacement5 001066 Driving pulley - Removal and
Refitting6 001006 driving pulley - Service
Time MP3 250 i.e.
TIME - 14
Transmission cover
TRANSMISSION COVER
Code Action Duration1 001135 Transmission cover bearing -
Replacement2 001096 Transmission crankcase cov-
er - Replacement3 001131 Transmission air intake - Re-
placement4 001170 Air duct - Replacement5 001132 Transmission air inlet pipe -
Replacement
MP3 250 i.e. Time
TIME - 15
Starter motor
ELECTRICAL START UPCode Action Duration
1 001020 Starter motor - Replacement2 005045 Starter motor cable harness -
Replacement3 001151 Start-up driven gearing - Re-
placement4 001017 Start-up pinion - Replace-
ment
Time MP3 250 i.e.
TIME - 16
Flywheel magneto
FLYWHEELCode Action Duration
1 001173 Rotor - Replacement2 001058 Complete flywheel - Replace-
ment3 001067 Stator - Removal and Refit-
ting4 001087 Flywheel cover - replace
MP3 250 i.e. Time
TIME - 17
Butterfly valve
THROTTLE BODYCode Action Duration
1 001047 Injector - Replacement2 001023 Control unit - Replacement3 001013 Intake manifold - change
Exhaust pipe
Time MP3 250 i.e.
TIME - 18
MUFFLERCode Action Duration
1 001095 Muffler guard - Replacement2 005138 Lambda probe - Replace-
ment3 001092 Exhaust manifold - Replace-
ment4 001009 Muffler - Replacement
Air cleaner
AIR CLEANERCode Action Duration
1 004122 Air cleaner carburettor fitting -Replacement
2 001014 Air filter - Replacement /cleaning
3 001015 Air filter box - Replacement
MP3 250 i.e. Time
TIME - 19
Frame
CHASSIS
Code Action Duration1 004146 Front frame - Replacement2 004116 Rear frame - Replacement3 004001 Frame - replace4 004147 footboard support bracket
one side - Replacement5 004143 Footrest support - replace
Time MP3 250 i.e.
TIME - 20
Centre-stand
STANDCode Action Duration
1 001053 Stand bolt - Replacement2 004179 Stand buffer - Replacement3 004004 Stand - Replacement
MP3 250 i.e. Time
TIME - 21
Legshield spoiler
FRONT SHIELD
Code Action Duration1 004020 Headlight frame - Replace-
ment2 004064 Front shield - Replacement3 004055 Turn indicator frame - Re-
placement4 004149 Shield central cover - Re-
placement5 004022 Shield lower section - Re-
placement6 004167 Grill / radiator cover - Re-
placement
Time MP3 250 i.e.
TIME - 22
Side fairings
SIDE COVERS
Code Action Duration1 004036 Lower chassis cover - Re-
placement2 004129 Rear fairing - Replacement3 004085 Fairing (1) - Replacement4 004068 Passenger handgrip - Re-
placement5 004037 Side aprons-Replacement
MP3 250 i.e. Time
TIME - 23
Rear cover
REAR SHIELDCode Action Duration
1 004065 Front shield, rear part - Re-moval and refitting
Time MP3 250 i.e.
TIME - 24
Central cover
CENTRAL COVERCode Action Duration
1 004059 Spark plug inspection flap -Replacement
2 004135 Fuel tank port - Replacement3 004011 Central chassis cover - Re-
placement4 004012 Rear fairings - Removal and
refitting5 004015 Footrest - Removal and Re-
fitting6 004075 Front mat - Replacement
MP3 250 i.e. Time
TIME - 25
Mudguard
MUDGUARDSCode Action Duration
1 007015 Radiator air intake - Replace-ment
2 004009 Rear mudguard - Replace-ment
3 004181 Lower cover - Replacement4 004184 Front mudguard support - re-
placement5 004002 Front mudguard - Replace-
ment
Time MP3 250 i.e.
TIME - 26
Fuel tank
FUEL TANK
Code Action Duration1 004137 Injector pump pipe - Replace-
ment2 005010 Tank float - Replacement3 004109 Fuel tank breather - Replace-
ment4 004168 Fuel tank cap - Replacement5 004138 Fuel reverse pipe - Replace-
ment6 004005 Fuel tank - Replacement7 004073 Fuel pump - Replacement
MP3 250 i.e. Time
TIME - 27
Rear shock-absorber
REAR SHOCK ABSORBERS
Code Action Duration1 003007 Rear shock absorber - Re-
moval and Refitting2 003035 Shock absorber support and
brake calliper - Replacement3 003077 muffler/rear shock absorber
support arm - Service
Time MP3 250 i.e.
TIME - 28
Handlebar covers
HANDLEBAR COVERSCode Action Duration
1 000307 RIGHT OR LEFT CONTROLASSEMBLY REPLACE-
MENT2 004019 Rear handlebar covers - Re-
placement3 004026 Handlebar cover - Replace-
ment4 004018 Front handlebar covers - Re-
placement
MP3 250 i.e. Time
TIME - 29
Handlebar components
HANDLEBAR COMPONENTS
Code Action Duration1 002059 Right-hand knob - change2 002060 Complete throttle control -
Replacement3 002063 Complete throttle control -
Replacement4 003001 Handlebar - Replacement5 002071 Left knob - Replacement6 003059 Counterweight - Replace-
ment7 002037 Brake lever - Replacement8 002048 Rear brake calliper - Re-
placement9 002067 Rear brake pump - Replace-
ment10 002080 Rear brake oil bleeding sys-
tem - Replacement11 004162 Mirror support and/or brake
pump fitting U-bolt - Replace-ment
12 002024 Front brake pump - replace13 002047 Front brake fluid and air
bleeding system - Replace-ment
Time MP3 250 i.e.
TIME - 30
Swing-arm
SWINGING ARMCode Action Duration
1 004058 Silent block - Replacement2 003081 Swinging arm support flange
- replace3 001072 Swinging arm - Engine-chas-
sis connection - Replacement4 003080 Swinging arm on frame - Re-
placement
MP3 250 i.e. Time
TIME - 31
Seat
SADDLECode Action Duration
1 004003 Saddle - Replacement
Time MP3 250 i.e.
TIME - 32
Instrument panel
INSTRUMENT PANEL
Code Action Duration1 004021 Shield upper section - Re-
placement2 005014 Odometer - Replacement3 004099 Odometer housing - Replace-
ment4 004035 Instrument panel - Replace-
ment
MP3 250 i.e. Time
TIME - 33
Locks
LOCKS
Code Action Duration1 004172 Rear case closure hook - Re-
placement2 005099 Electric saddle opening acti-
vator - Replacement3 004054 Saddle lock catch - Replace-
ment4 004001 Chassis - Replacement5 005072 Immobilizer aerial - Replace-
ment
Turn signal lightsRear lights
Time MP3 250 i.e.
TIME - 34
REAR TURN INDICATORS INDICATOR LIGHTS
Code Action Duration1 005005 Taillight - Replacement2 005022 Rear turn indicators - Re-
placement3 005031 Licence plate light bulb - Re-
placement4 005032 Transparent licence plate
cover - replace5 005131 Licence plate light support -
Replacement6 005066 Rear light bulbs - Replace-
ment7 005068 Rear turn indicator bulb - Re-
placement
Front lights
MP3 250 i.e. Time
TIME - 35
FRONT TURN INDICATORS INDICATOR LIGHTS
Code Action Duration1 005067 Front direction indicator bulb
- Replacement2 005012 Front direction indicators -
Replacement3 005002 Front light - Replacement4 005008 Light bulbs - Replacement
Time MP3 250 i.e.
TIME - 36
Front wheel
FRONT WHEELS
Code Action Duration1 003047 Front tyre - Replacement2 003033 Front wheel hub- Replace-
ment3 003037 Front wheel rim- Replace-
ment4 005089 Tone wheel - Replacement5 002041 Front brake disc - Replace-
ment6 004123 Front wheel - Replacement
MP3 250 i.e. Time
TIME - 37
Rear wheel
REAR WHEEL
Code Action Duration1 002070 Rear brake disc - Replace-
ment2 001016 Rear wheel - Replacement3 001071 Front wheel rim - Removal
and refitting4 004126 Rear wheel tyre - Replace-
ment
Time MP3 250 i.e.
TIME - 38
Electric devices
ELECTRICAL DEVICES
Code Action Duration1 005075 Stop remote control - Re-
placement2 005035 Headlight remote control -
Replacement3 005011 Start-up remote control
switch - Replacement4 005007 Battery - Replacement5 005003 Horn - Replacement
MP3 250 i.e. Time
TIME - 39
CABLE HARNESS
Code Action Duration1 005001 Electrical system - Replace-
ment2 005114 Electrical system - Service
Time MP3 250 i.e.
TIME - 40
Electronic controls
HANDLEBAR CONTROLS
Code Action Duration1 005017 Stop switch - Replacement2 005077 Emergency stop switch - Re-
placement3 005041 Starter button - Replacement4 004010 Anti-theft lock - Replacement5 005040 Horn button - Replacement6 005006 Light switch or turn indicators
- Replacement7 005039 Headlight switch - replace
MP3 250 i.e. Time
TIME - 41
Transmissions
LOCKS TRANSMISSIONS
Code Action Duration1 003094 Tilt locking calliper control ca-
ble - replacement2 002082 Fuel tank cap opening drive -
Replacement3 002083 Saddle opening transmission
- Replacement4 002093 Trunk opening transmission -
Replacement5 003061 Accelerator transmission -
Adjustment
Time MP3 250 i.e.
TIME - 42
Helmet bay
HELMET COMPARTMENT
Code Action Duration1 005046 Battery cover - change2 005026 Helmet compartment bulb -
Replacement3 005027 Helmet compartment bulb
support - Replacement4 004016 Helmet compartment - Re-
placement
MP3 250 i.e. Time
TIME - 43
Rear side fairings
REAR COVERS
Code Action Duration1 004081 Glove box door - Replace-
ment2 004174 Trunk leverage3 004141 Cat's eye - Replacement4 005048 Licence plate holder - Re-
placement5 004082 Trunk gasket - Replacement
Time MP3 250 i.e.
TIME - 44
Front suspension
FRONT SUSPENSIONCode Action Duration
1 003010 Front suspension - Service2 003111 Side steering tube - replace-
ment3 003038 Front wheel axle - Removal
and Refit.4 003040 Front wheel bearings - Re-
placement5 003107 Sliding stems - replacement6 003113 Front shock absorber - re-
placement
MP3 250 i.e. Time
TIME - 45
Cooling system
COOLING SYSTEM
Code Action Duration1 007013 Radiator expansion tank con-
nection pipe - Replacement2 001052 Coolant and air bleed - Re-
placement3 007001 Expansion tank - Replace-
ment4 007024 Expansion tank cap - Re-
placement5 007003 Coolant delivery and return
pipe - Replacement6 007016 Fan with support - Replace-
ment7 007002 Water radiator - replacement
Time MP3 250 i.e.
TIME - 46
Braking system
BRAKE SYSTEM
Code Action Duration1 002025 Brake piping - Replacement2 003096 Tilt locking calliper- replace-
ment3 003100 Tilt locking calliper pads - re-
placement4 003108 Parking brake flexible trans-
mission - replacement5 003109 Parking brake mechanical
calliper - replacement6 002002 Shoes - Rear brake pads -
Replacement7 002020 Rear brake pipes - Removal
and refitting8 002081 Rear brake disc piping - Re-
placement9 003118 Tilt locking disc section - re-
placement
MP3 250 i.e. Time
TIME - 47
Code Action Duration10 003103 Splitter for suspension lock-
ing system hoses- replace-ment
11 003102 Hoses for the splitter-callipersuspension locking system -
replacement12 003088 Tilt locking hydraulic pump -
replacement13 002021 Front brake piping - Replace-
ment14 002007 Front brake pads - Replace-
ment15 002039 Front brake calliper - Re-
placement16 003104 Suspension system locking
calliper- replacement17 003119 Hoses for the pump-splitter
suspension locking system -replacement
18 003105 Suspension locking systembrake fluid - repl.
19 003106 Suspension locking systempressure sensor-Replace-
ment
Windscreen
Time MP3 250 i.e.
TIME - 48
WINDSHIELDCode Action Duration
1 004101 Windshield - Replacement
Stickers
TRANSFERS
Code Action Duration1 004066 Driving mirror - Replacement2 004159 Plates / Stickers - Replace-
ment
MP3 250 i.e. Time
TIME - 49
The tilt mechanism
TILT MECHANISM
Code Action Duration1 003073 Steering clearance - Adjust-
ment2 003112 Central steering tube - re-
placement3 003002 Steering fifth wheel - Re-
placement4 003115 Parallelogram arms - re-
placement5 003114 Parallelogram bearings - re-
placement6 003116 Steering rod - replacement7 003117 Constant-velocity universal
joint - replacement
Time MP3 250 i.e.
TIME - 50
Geared motor
GEARED MOTOR
Code Action Duration1 003101 Tilt locking calliper control
lever - replacement2 005009 Voltage regulator - replace3 003095 Tilt locking calliper support
bracket - replacement4 001069 HV coil - replace5 001094 Spark plug cap - Replace-
ment6 003120 Tilt locking control unit - re-
placement7 003093 Geared motor crankcase - re-
placement8 003090 Geared electric motor - re-
placement9 003092 Geared motor bearings - re-
placement10 003091 Geared motor pinion - re-
placement
MP3 250 i.e. Time
TIME - 51
Code Action Duration11 003089 Geared motor potentiometer
- replacement
Time MP3 250 i.e.
TIME - 52